Heteroaryls and uses thereof

ABSTRACT

The present invention provides a compound of formula I: 
                         
and pharmaceutically acceptable salts thereof, wherein X, R 1 , R 2 , R 3 , R 4 , R 5 , L 1 , L 2 , m, and n, are as described in the specification. Such compounds are inhibitors of VPS34 and thus useful for treating proliferative, inflammatory, or cardiovascular disorders.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit of U.S. Provisional Application No. 62/054,742, filed Sep. 24, 2014, and U.S. Provisional Application No. 61/927,055, filed Jan. 14, 2014, each of which is incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

Phosphatidylinositol 3-kinase (PI3K) is a family of lipid kinases that phosphorylate phosphatidylinositol at the 3′ position of the inositol ring. PI3K is comprised of several classes of genes, including Class IA, IB, II and III and some of these classes contain several isoforms (reviewed in Engelman et al., Nature Review Genetics 7:606-619 (2006)). Adding to the complexity of this family is the fact that PI3Ks function as heterodimers, comprising a catalytic domain and a regulatory domain. The PI3K family is structurally related to a larger group of lipid and serine/threonine protein kinases known as the phosphatidylinositol 3-kinase like kinases (PIKKs), which also includes DNA-PK, ATM, ATR, mTOR, TRRAP and SMG1.

Vacuolar Protein Sorting 34 (VPS34) is the sole Class III PI3K family member. VPS34 functions in the formation and trafficking of multiple intracellular vesicles, including vacuoles, endosomes, multivessicular bodies, lysosomes and autophagosomes (reviewed in Backer Biochem J 2008; Yan and Backer Biochem J 2007). VPS34 carries out these activities by phosphorylating PtdIns forming PtdIns3P, resulting in the recruitment and localization of a variety of FYVE and PX domain containing effector proteins that facilitate vesicular formation, elongation and movement. At a cellular level, inhibition of VPS34 results in defects in protein sorting and autophagy. Broadly defined, autophagy is a regulated process whereby cells catabolize subcellular components targeted for degradation by enclosing them in double-membrane vesicles which then fuse with lysosomes. Autophagy has been best characterized as occurring during times of nutrient deprivation, but also plays a role in normal cellular and tissue homeostasis and functions, including the development of multiple tissue types, the immune response, clearance of neuronal aggregates and tumor suppression. In addition to functioning in vesicle formation and movement, VPS34 may also participate in several signal transduction pathways (reviewed in Backer Biochem J 2008). Given that VPS34 plays an important role in many critical cellular processes including autophagy, inhibitors of VPS34 may have therapeutic application in a number of diseases, including but not limited to cancer, muscular disorders, neurodegeneration, inflammatory disease, infectious disease and other age related illnesses (reviewed in Shintani and Klionsky Science 2004; Kondo et al Nat Rev Cancer 2005; Delgato et al Immunol Rev 2009). Therefore, it would be beneficial to provide novel VPS34 inhibitors that possess good therapeutic properties, especially for the treatment of proliferative, inflammatory, or cardiovascular disorders.

DETAILED DESCRIPTION OF THE INVENTION 1. General Description of Certain Embodiments of the Invention

This invention provides compounds that are inhibitors of VPS34, and accordingly can be useful for the treatment of proliferative, inflammatory, or cardiovascular disorders.

In some embodiments, the present invention provides a compound of formula I:

or a pharmaceutically acceptable salt thereof, wherein:

-   each of R¹ and R³, independently, is hydrogen, C₁₋₆ aliphatic,     3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered     heterocyclyl having 1-4 heteroatoms independently selected from     nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4     heteroatoms independently selected from nitrogen, oxygen or sulfur;     each of which being optionally substituted with 1-5 R⁶ wherein:     -   each R⁶ independently is —CN, halo or -L³-R⁷ wherein:     -   L³ is a bond, C₁₋₄ alkylene, —O—, —S—, —S(O)—, —S(O)₂—, —C(O)—,         —CO₂—, —C(O)NR^(x)—, —N(R^(x))C(O)—, —N(R^(x))CO₂—,         —S(O)₂NR^(x)—, —N(R^(x))S(O)₂—, —OC(O)N(R^(x))—,         —N(R^(x))C(O)N(R^(x)), —N(R^(x))S(O)₂N(R^(x))— or —OC(O)—; where         each R^(x), independently, is hydrogen or C₁₋₄ alkyl, and     -   R⁷ is hydrogen, C₁₋₆ aliphatic, 3-10-membered cycloaliphatic,         phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4         heteroatoms independently selected from nitrogen, oxygen, or         sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms         independently selected from nitrogen, oxygen, or sulfur; -   X is a bond or C₁₋₄ aliphatic; -   L¹ is —N(R⁸)C(O)—, —C(O)—N(R⁹)—, —N(R¹⁰)S(O)₂—, —S(O)₂NR¹¹—, —C(O)—,     —C(S)—, —S(O)₂—, —N(R′²)—, —O—C(O)—, —C(O)—O—, —O—S(O)₂—, —S(O)₂—O—,     —N(R¹³)C(O)N(R¹⁴)—, or —N(R¹⁵)S(O)₂N(R¹⁶)—; and wherein each of R⁸,     R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁴, R¹⁵, and R¹⁶, independently, is     hydrogen or C₁₋₄alkyl; and     -   X or L¹ can optionally join with R¹ to form an optionally         substituted 5-6-membered heterocyclyl or optionally substituted         5-6-membered heteroaryl; -   R² is hydrogen or C₁₋₄ alkyl; -   L² is a bond, —C(O)—, —S(O)₂—, —C(O)—O—, —C(O)N(R^(y))—, or     —S(O)₂N(R^(y))—; wherein each R^(y), independently, is hydrogen or     C₁₋₄ alkyl;     -   each occurrence of R⁴ and R⁵, independently, is —CN, halo or         -L⁴-R¹⁷ wherein     -   L⁴ is C₁₋₄ alkylene, —O—, —N(R^(z))—, —S—, —S(O)—, —S(O)₂—,         —C(O)—, —CO₂—, —C(O)N(R^(z))—, —N(R^(z))C(O)—, —N(R^(z))C(O)O—,         —S(O)₂N(R^(z))—, —N(R^(z))S(O)₂—, —OC(O)N(R^(z))—,         —N(R^(z))C(O)N(R^(z))—, —N(R^(z))S(O)₂N(R^(z))— or —OC(O)—;         where each R^(z), independently, is hydrogen or C₁₋₄ alkyl, and -   R¹⁷ is hydrogen or C₁₋₆ aliphatic; and -   each of m and n, independently, is 0-3; -   provided that (1) if one R⁴ is substituted at the ring carbon     between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is     substituted, X or L¹ can join with said R⁴ to form an optionally     substituted 5-7-membered heterocyclyl or an optionally substituted     5-6-membered heteroaryl; or (2) if one R⁴ is substituted at either     ring carbon adjacent to the ring nitrogen, said R⁴ can join with the     ring nitrogen to form an optionally substituted 5-7-membered     heterocyclyl or an optionally substituted 5-6-membered heteroaryl;     or (3) if L² is a bond and R³ is phenyl, naphthyl, or heteroaryl, R²     can join with a substituent of R³ to form an optionally substituted     5-7-membered heterocyclyl or an optionally substituted 5-6-membered     heteroaryl. Note that provisos (1), (2), and (3) are not exclusive     of each other.

For clarity, it is understood that the connectivity of the -L¹-moiety should be read from left to right. That is, the first listed atom in the exemplary L¹ groups (from left) described herein is covalently bonded to —X— moiety. Accordingly, exemplary —X-L¹-R¹ moieties described herein include —X—N(R⁸)C(O)—R¹, —X—C(O)—N(R⁹)—R¹, —X—N(R¹⁰)S(O)₂—R¹, —X—S(O)₂NR¹¹—R¹, —X—C(O)—R¹, —X—S(O)₂—R¹, —X—N(R′²)—R¹, —X—O—C(O)—R¹, —X—O—S(O)₂—R¹, —X—S(O)₂—O—R¹, —X—N(R¹³)C(O)N(R¹⁴)—R¹, and —X—N(R¹⁵)S(O)₂N(R¹⁶)—R′. Similarly, the connectivity of the -L²-moiety should be read from right to left. That is, the first listed atom in the exemplary L² groups (from left) described herein is covalently bonded to the —NR²-moiety. Accordingly, exemplary —NR²-L²-R³ moieties described herein include —NR²R³, —NR²—C(O)—R³, —NR²—S(O)₂—R³, —NR²—C(O)—O—R³, —NR²—C(O)N(R^(y))—R³, and —NR²—S(O)₂N(R^(y))—R³. Other bivalent L groups should be read in similar manner.

2. Compounds and Definitions

Compounds of this invention include those described generally for formula I, above, and are further illustrated by the classes, subclasses, and species disclosed herein. It will be appreciated that preferred subsets described for each variable herein can be used for any of the structural subsets as well. As used herein, the following definitions shall apply unless otherwise indicated.

As described herein, compounds of the invention may be optionally substituted with one or more substituents, such as are illustrated generally above, or as exemplified by particular classes, subclasses, and species of the invention. It will be appreciated that the phrase “optionally substituted” is used interchangeably with the phrase “substituted or unsubstituted.” In general, the term “substituted”, whether preceded by the term “optionally” or not, means that a hydrogen radical of the designated moiety is replaced with the radical of a specified substituent, provided that the substitution results in a stable or chemically feasible compound. The term “substitutable”, when used in reference to a designated atom, means that attached to the atom is a hydrogen radical, which hydrogen atom can be replaced with the radical of a suitable substituent. Unless otherwise indicated, an “optionally substituted” group may have a substituent at each substitutable position of the group, and when more than one position in any given structure may be substituted with more than one substituent selected from a specified group, the substituent may be either the same or different at every position. Combinations of substituents envisioned by this invention are preferably those that result in the formation of stable or chemically feasible compounds.

A stable compound or chemically feasible compound is one in which the chemical structure is not substantially altered when kept at a temperature from about −80° C. to about +40°, in the absence of moisture or other chemically reactive conditions, for at least a week, or a compound which maintains its integrity long enough to be useful for therapeutic or prophylactic administration to a patient.

The phrase “one or more substituents”, as used herein, refers to a number of substituents that equals from one to the maximum number of substituents possible based on the number of available bonding sites, provided that the above conditions of stability and chemical feasibility are met.

As used herein, the term “independently selected” means that the same or different values may be selected for multiple instances of a given variable in a single compound.

As used herein, the term “aromatic” includes aryl and heteroaryl groups as described generally below and herein.

The term “aliphatic” or “aliphatic group”, as used herein, means an optionally substituted straight-chain or branched C₁₋₁₂ hydrocarbon which is completely saturated or which contains one or more units of unsaturation. For example, suitable aliphatic groups include optionally substituted linear or branched alkyl, alkenyl, and alkynyl groups. Unless otherwise specified, in various embodiments, aliphatic groups have 1-12, 1-10, 1-8, 1-6, 1-4, 1-3, or 1-2 carbon atoms. It is apparent to a skilled person in the art that in some embodiments, the “aliphatic” group described herein can be bivalent.

The term “alkyl”, used alone or as part of a larger moiety, refers to a saturated, optionally substituted straight or branched chain hydrocarbon group having 1-12, 1-10, 1-8, 1-6, 1-4, 1-3, or 1-2 carbon atoms.

The term “alkenyl”, used alone or as part of a larger moiety, refers to an optionally substituted straight or branched chain hydrocarbon group having at least one double bond and having 2-12, 2-10, 2-8, 2-6, 2-4, or 2-3 carbon atoms.

The term “alkynyl”, used alone or as part of a larger moiety, refers to an optionally substituted straight or branched chain hydrocarbon group having at least one triple bond and having 2-12, 2-10, 2-8, 2-6, 2-4, or 2-3 carbon atoms.

The terms “cycloaliphatic”, “carbocycle”, “carbocyclyl”, “carbocyclo”, or “carbocyclic”, used alone or as part of a larger moiety, refer to an optionally substituted saturated or partially unsaturated cyclic aliphatic ring system having from 3 to about 14 ring carbon atoms. In some embodiments, the cycloaliphatic group is an optionally substituted monocyclic hydrocarbon having 3-8 or 3-6 ring carbon atoms. Cycloaliphatic groups include, without limitation, optionally substituted cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, cyclohexenyl, cycloheptyl, cycloheptenyl, cyclooctyl, cyclooctenyl, or cyclooctadienyl. The terms “cycloaliphatic”, “carbocycle”, “carbocyclyl”, “carbocyclo”, or “carbocyclic” also include optionally substituted bridged or fused bicyclic rings having 6-12, 6-10, or 6-8 ring carbon atoms, wherein any individual ring in the bicyclic system has 3-8 ring carbon atoms.

The term “cycloalkyl” refers to an optionally substituted saturated ring system of about 3 to about 10 ring carbon atoms. Exemplary monocyclic cycloalkyl rings include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl.

The term “cycloalkenyl” refers to an optionally substituted non-aromatic monocyclic or multicyclic ring system containing at least one carbon-carbon double bond and having about 3 to about 10 carbon atoms. Exemplary monocyclic cycloalkenyl rings include cyclopentyl, cyclohexenyl, and cycloheptenyl.

The term “halogen” or “halo” means F, Cl, Br, or I.

The term “heteroatom” refers to one or more of oxygen, sulfur, nitrogen, phosphorus, and silicon (including, any oxidized form of nitrogen, sulfur, phosphorus, or silicon; the quaternized form of any basic nitrogen or; a substitutable nitrogen of a heterocyclic ring, for example N (as in 3,4-dihydro-2H-pyrrolyl), NH (as in pyrrolidinyl) or NR⁺ (as in N-substituted pyrrolidinyl)).

The terms “aryl” and “ar-”, used alone or as part of a larger moiety, e.g., “aralkyl”, “aralkoxy”, or “aryloxyalkyl”, refer to an optionally substituted C₆₋₁₄ aromatic hydrocarbon moiety comprising one to three aromatic rings. For example, the aryl group is a C₆₋₁₀aryl group (i.e., phenyl and naphthyl). Aryl groups include, without limitation, optionally substituted phenyl, naphthyl, or anthracenyl. The terms “aryl” and “ar-”, as used herein, also include groups in which an aryl ring is fused to one or more cycloaliphatic rings to form an optionally substituted cyclic structure such as a tetrahydronaphthyl, indenyl, or indanyl ring. The term “aryl” may be used interchangeably with the terms “aryl group”, “aryl ring”, and “aromatic ring”.

An “aralkyl” or “arylalkyl” group comprises an aryl group covalently attached to an alkyl group, either of which independently is optionally substituted. For example, the aralkyl group is C₆₋₁₀ arylC₁₋₆alkyl, including, without limitation, benzyl, phenethyl, and naphthylmethyl.

The terms “heteroaryl” and “heteroar-”, used alone or as part of a larger moiety, e.g., “heteroaralkyl”, or “heteroaralkoxy”, refer to groups having 5 to 14 ring atoms, preferably 5, 6, 9, or 10 ring atoms; having 6, 10, or 14 π electrons shared in a cyclic array; and having, in addition to carbon atoms, from one to five heteroatoms. A heteroaryl group may be mono-, bi-, tri-, or polycyclic, for example, mono-, bi-, or tricyclic (e.g., mono- or bicyclic). The term “heteroatom” refers to nitrogen, oxygen, or sulfur, and includes any oxidized form of nitrogen or sulfur, and any quaternized form of a basic nitrogen. For example, a nitrogen atom of a heteroaryl may be a basic nitrogen atom and may also be optionally oxidized to the corresponding N-oxide. When a heteroaryl is substituted by a hydroxy group, it also includes its corresponding tautomer. The terms “heteroaryl” and “heteroar-”, as used herein, also include groups in which a heteroaromatic ring is fused to one or more aryl, cycloaliphatic, or heterocycloaliphatic rings. Nonlimiting examples of heteroaryl groups include thienyl, furanyl, pyrrolyl, imidazolyl, pyrazolyl, triazolyl, tetrazolyl, oxazolyl, isoxazolyl, oxadiazolyl, thiazolyl, isothiazolyl, thiadiazolyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, indolizinyl, purinyl, naphthyridinyl, pteridinyl, indolyl, isoindolyl, benzothienyl, benzofuranyl, dibenzofuranyl, indazolyl, benzimidazolyl, benzthiazolyl, quinolyl, isoquinolyl, cinnolinyl, phthalazinyl, quinazolinyl, quinoxalinyl, 4H-quinolizinyl, carbazolyl, acridinyl, phenazinyl, phenothiazinyl, phenoxazinyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, and pyrido[2,3-b]-1,4-oxazin-3(4H)-one. The term “heteroaryl” may be used interchangeably with the terms “heteroaryl ring”, “heteroaryl group”, or “heteroaromatic”, any of which terms include rings that are optionally substituted. The term “heteroaralkyl” refers to an alkyl group substituted by a heteroaryl, wherein the alkyl and heteroaryl portions independently are optionally substituted.

As used herein, the terms “heterocycle”, “heterocyclyl”, “heterocyclic radical”, and “heterocyclic ring” are used interchangeably and refer to a stable 3- to 8-membered monocyclic or 7-10-membered bicyclic heterocyclic moiety that is either saturated or partially unsaturated, and having, in addition to carbon atoms, one or more, such as one to four, heteroatoms, as defined above. When used in reference to a ring atom of a heterocycle, the term “nitrogen” includes a substituted nitrogen. As an example, in a saturated or partially unsaturated ring having 0-3 heteroatoms selected from oxygen, sulfur or nitrogen, the nitrogen may be N (as in 3,4-dihydro-2H-pyrrolyl), NH (as in pyrrolidinyl), or NR⁺ (as in N-substituted pyrrolidinyl).

A heterocyclic ring can be attached to its pendant group at any heteroatom or carbon atom that results in a stable structure and any of the ring atoms can be optionally substituted. Examples of such saturated or partially unsaturated heterocyclic radicals include, without limitation, tetrahydrofuranyl, tetrahydrothienyl, piperidinyl, decahydroquinolinyl, oxazolidinyl, piperazinyl, dioxanyl, dioxolanyl, diazepinyl, oxazepinyl, thiazepinyl, morpholinyl, and thiamorpholinyl. A heterocyclyl group may be mono-, bi-, tri-, or polycyclic, preferably mono-, bi-, or tricyclic, more preferably mono- or bicyclic. The term “heterocyclylalkyl” refers to an alkyl group substituted by a heterocyclyl, wherein the alkyl and heterocyclyl portions independently are optionally substituted. Additionally, a heterocyclic ring also includes groups in which the heterocyclic ring is fused to one or more aryl rings.

As used herein, the term “partially unsaturated” refers to a ring moiety that includes at least one double or triple bond between ring atoms. The term “partially unsaturated” is intended to encompass rings having multiple sites of unsaturation, but is not intended to include aromatic (e.g., aryl or heteroaryl) moieties, as herein defined.

The term “alkylene” refers to a bivalent alkyl group. An “alkylene chain” is a polymethylene group, i.e., —(CH₂)_(n)—, wherein n is a positive integer, e.g., from 1 to 6, from 1 to 4, from 1 to 3, from 1 to 2, or from 2 to 3. An optionally substituted alkylene chain is a polymethylene group in which one or more methylene hydrogen atoms is optionally replaced with a substituent. Suitable substituents include those described below for a substituted aliphatic group and also include those described in the specification herein. It will be appreciated that two substituents of the alkylene group may be taken together to form a ring system. In certain embodiments, two substituents can be taken together to form a 3-7-membered ring. The substituents can be on the same or different atoms.

An alkylene chain also can be optionally interrupted by a functional group. An alkylene chain is “interrupted” by a functional group when an internal methylene unit is interrupted or replaced by the functional group. Examples of suitable “interrupting functional groups” are described in the specification and claims herein.

For purposes of clarity, and unless otherwise stated, all bivalent groups described herein, including, e.g., the alkylene chain linkers described above, are intended to be read from left to right, with a corresponding left-to-right reading of the formula or structure in which the variable appears.

An aryl (including aralkyl, aralkoxy, aryloxyalkyl and the like) or heteroaryl (including heteroaralkyl and heteroarylalkoxy and the like) group may contain one or more substituents and thus may be “optionally substituted”. In addition to the substituents defined above and herein, suitable substituents on the unsaturated carbon atom of an aryl group (e.g., phenyl or naphthyl) or heteroaryl group (e.g., pyridyl) also include and are generally selected

from -halo, —NO₂, —CN, —R⁺, —C(R⁺)═C(R⁺)₂, —C≡C—R⁺, —OR⁺, —SR^(o), —S(O)R^(o), —SO₂R^(o), —SO₃R⁺, —SO₂N(R⁺)₂, —N(R⁺)₂, —NR⁺C(O)R⁺, —NR⁺C(S)R⁺, —NR⁺C(O)N(R⁺)₂, —NR⁺C(S)N(R⁺)₂, —N(R⁺)C(═NR⁺)—N(R⁺)₂, —N(R⁺)C(═NR⁺)—R^(o), —NR⁺CO₂R⁺, —NR⁺SO₂R^(o), —NR⁺SO₂N(R⁺)₂, —O—C(O)R⁺, —O—CO₂R⁺, —OC(O)N(R⁺)₂, —C(O)R⁺, —C(S)R^(o), —CO₂R⁺, —C(O)—C(O)R⁺, —C(O)N(R⁺)₂, —C(S)N(R⁺)₂, —C(O)N(R⁺)—OR⁺, —C(O)N(R⁺)C(═NR⁺)—N(R⁺)₂, —N(R⁺)C(═NR⁺)—N(R⁺)—C(O)R⁺, —C(═NR⁺)—N(R⁺)₂, —C(═NR⁺)—OR⁺, —N(R⁺)—N(R⁺)₂, —C(═NR⁺)—N(R⁺)—OR⁺, —C(R^(o)═N—OR⁺, —P(O)(R⁺)₂, —P(O)(OR⁺)₂, —O—P(O)—OR⁺, and —P(O)(NR⁺)—N(R⁺)₂, wherein R⁺, independently, is hydrogen or an optionally substituted aliphatic, aryl, heteroaryl, cycloaliphatic, or heterocyclyl group, or two independent occurrences of R⁺ are taken together with their intervening atom(s) to form an optionally substituted 5-7-membered aryl, heteroaryl, cycloaliphatic, or heterocyclyl ring. Each R^(o) is an optionally substituted aliphatic, aryl, heteroaryl, cycloaliphatic, or heterocyclyl group.

An aliphatic or heteroaliphatic group, or a non-aromatic carbocyclic or heterocyclic ring may contain one or more substituents and thus may be “optionally substituted”. Unless otherwise defined above and herein, suitable substituents on the saturated carbon of an aliphatic or heteroaliphatic group, or of a non-aromatic carbocyclic or heterocyclic ring are selected from those listed above for the unsaturated carbon of an aryl or heteroaryl group and additionally include the following: ═O, ═S, ═C(R*)₂, ═N—N(R*)₂, ═N—OR*, ═N—NHC(O)R*, ═N—NHCO₂R^(o)═N—NHSO₂R^(o) or ═N—R* where R^(o) is defined above, and each R* is independently selected from hydrogen or an optionally substituted C₁₋₆ aliphatic group.

In addition to the substituents defined above and herein, optional substituents on the nitrogen of a non-aromatic heterocyclic ring also include and are generally selected from —R⁺, —N(R⁺)₂, —C(O)R⁺, —C(O)OR⁺, —C(O)C(O)R⁺, —C(O)CH₂C(O)R⁺, —S(O)₂R⁺, —S(O)₂N(R⁺)₂, —C(S)N(R⁺)₂, —C(═NH)—N(R⁺)₂, or —N(R⁺)S(O)₂R⁺; wherein each R⁺ is defined above. A ring nitrogen atom of a heteroaryl or non-aromatic heterocyclic ring also may be oxidized to form the corresponding N-hydroxy or N-oxide compound. A nonlimiting example of such a heteroaryl having an oxidized ring nitrogen atom is N-oxidopyridyl.

As detailed above, in some embodiments, two independent occurrences of R⁺ (or any other variable similarly defined in the specification and claims herein), are taken together with their intervening atom(s) to form a monocyclic or bicyclic ring selected from 3-13-membered cycloaliphatic, 3-12-membered heterocyclyl having 1-5 heteroatoms independently selected from nitrogen, oxygen, or sulfur, 6-10-membered aryl, or 5-10-membered heteroaryl having 1-5 heteroatoms independently selected from nitrogen, oxygen, or sulfur.

Exemplary rings that are formed when two independent occurrences of R⁺ (or any other variable similarly defined in the specification and claims herein), are taken together with their intervening atom(s) include, but are not limited to the following: a) two independent occurrences of R⁺ (or any other variable similarly defined in the specification or claims herein) that are bound to the same atom and are taken together with that atom to form a ring, for example, N(R⁺)₂, where both occurrences of R⁺ are taken together with the nitrogen atom to form a piperidin-1-yl, piperazin-1-yl, or morpholin-4-yl group; and b) two independent occurrences of R⁺ (or any other variable similarly defined in the specification or claims herein) that are bound to different atoms and are taken together with both of those atoms to form a ring, for example where a phenyl group is substituted with two occurrences of OR⁺

these two occurrences of R⁺ are taken together with the oxygen atoms to which they are bound to form a fused 6-membered oxygen containing ring:

It will be appreciated that a variety of other rings (e.g., spiro and bridged rings) can be formed when two independent occurrences of R⁺ (or any other variable similarly defined in the specification and claims herein) are taken together with their intervening atom(s) and that the examples detailed above are not intended to be limiting.

Unless otherwise stated, structures depicted herein are also meant to include all isomeric (e.g., enantiomeric, diastereomeric, and geometric (or conformational)) forms of the structure; for example, the R and S configurations for each asymmetric center, (Z) and (E) double bond isomers, and (Z) and (E) conformational isomers. Therefore, single stereochemical isomers as well as enantiomeric, diastereomeric, and geometric (or conformational) mixtures of the present compounds are within the scope of the invention. Unless otherwise stated, all tautomeric forms of the compounds of the invention are within the scope of the invention. Additionally, unless otherwise stated, structures depicted herein are also meant to include compounds that differ only in the presence of one or more isotopically enriched atoms. For example, compounds having the present structures where there is a replacement of hydrogen by deuterium or tritium, or a replacement of a carbon by a ¹³C- or ¹⁴C-enriched carbon are within the scope of this invention. Such compounds are useful, as a nonlimiting example, as analytical tools or probes in biological assays.

It is to be understood that, when a disclosed compound has at least one chiral center, the present invention encompasses one enantiomer of inhibitor free from the corresponding optical isomer, racemic mixture of the inhibitor and mixtures enriched in one enantiomer relative to its corresponding optical isomer. When a mixture is enriched in one enantiomer relative to its optical isomers, the mixture contains, for example, an enantiomeric excess of at least 50%, 75%, 90%, 95% 99% or 99.5%.

The enantiomers of the present invention may be resolved by methods known to those skilled in the art, for example by formation of diastereoisomeric salts which may be separated, for example, by crystallization; formation of diastereoisomeric derivatives or complexes which may be separated, for example, by crystallization, gas-liquid or liquid chromatography; selective reaction of one enantiomer with an enantiomer-specific reagent, for example enzymatic esterification; or gas-liquid or liquid chromatography in a chiral environment, for example on a chiral support for example silica with a bound chiral ligand or in the presence of a chiral solvent. Where the desired enantiomer is converted into another chemical entity by one of the separation procedures described above, a further step is required to liberate the desired enantiomeric form. Alternatively, specific enantiomers may be synthesized by asymmetric synthesis using optically active reagents, substrates, catalysts or solvents, or by converting one enantiomer into the other by asymmetric transformation.

When a disclosed compound has at least two chiral centers, the present invention encompasses a diastereomer free of other diastereomers, a pair of diastereomers free from other diasteromeric pairs, mixtures of diasteromers, mixtures of diasteromeric pairs, mixtures of diasteromers in which one diastereomer is enriched relative to the other diastereomer(s) and mixtures of diasteromeric pairs in which one diastereomeric pair is enriched relative to the other diastereomeric pair(s). When a mixture is enriched in one diastereomer or diastereomeric pair(s) relative to the other diastereomers or diastereomeric pair(s), the mixture is enriched with the depicted or referenced diastereomer or diastereomeric pair(s) relative to other diastereomers or diastereomeric pair(s) for the compound, for example, by a molar excess of at least 50%, 75%, 90%, 95%, 99% or 99.5%.

The diastereoisomeric pairs may be separated by methods known to those skilled in the art, for example chromatography or crystallization and the individual enantiomers within each pair may be separated as described above. Specific procedures for chromatographically separating diastereomeric pairs of precursors used in the preparation of compounds disclosed herein are provided the examples herein.

3. Brief Description of the Drawings

FIG. 1 is a graph showing the effect of treatment with a compound of formula I (I-41) and erlotinib when administered orally (po) daily (qd) as single agents and in combination to nude female mice bearing human colorectal adenocarcinoma SW48 tumor xenografts.

FIG. 2 is a graph showing the effect of treatment with a compound of formula I (I-41) and erlotinib when administered orally (po) daily (qd) as single agents and in combination to nude female mice bearing human non-small cell lung PC9 tumor xenografts.

FIG. 3 is a graph showing the effect of treatment with a compound of formula I (I-41) and erlotinib when administered orally (po) daily (qd) as single agents and in combination to nude female mice bearing human non-small cell lung NCI H1650 tumor xenografts.

FIG. 4 is a graph showing the effect of treatment with a compound of formula I (I-41) and afatinib when administered orally (po) daily (qd) as single agents and in combination to nude female mice bearing human non-small cell lung NCI-H1975 tumor xenografts.

FIG. 5 is a graph showing the effect of treatment with a compound of formula I (I-299) and erlotinib when administered orally (po) daily (qd) as single agents and in combination to nude female mice bearing human non-small cell lung PC9 tumor xenografts.

FIG. 6 is a graph showing the effect of treatment with a compound of formula I (I-299) and erlotinib when administered orally (po) daily (qd) as single agents and in combination to nude female mice bearing human non-small cell lung NCI H1650 tumor xenografts.

FIG. 7 is an XRPD trace of Compound I-41 slurried in IPA/Water to give Pattern 4 (most stable form).

FIG. 8 is an XRPD trace of a representative lot of Compound I-299.

4. Description of Exemplary Compounds

As described generally above, in some embodiments the present invention provides a compound of formula I:

-   or a pharmaceutically acceptable salt thereof, wherein: -   each of R¹ and R³, independently, is hydrogen, C₁₋₆ aliphatic,     3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered     heterocyclyl having 1-4 heteroatoms independently selected from     nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4     heteroatoms independently selected from nitrogen, oxygen or sulfur;     each of which being optionally substituted with 1-5 R⁶ wherein: each     R⁶ independently is —CN, halo or -L³-R⁷ wherein:     -   L³ is a bond, C₁₋₄ alkylene, —O—, —N(R^(x))—, —S—, —S(O)—,         —S(O)₂—, —C(O)—, —CO₂—, —C(O)NR^(x)—, —N(R^(x))C(O)—,         —N(R^(x))CO₂—, —S(O)₂NR^(x)—, —N(R^(x))S(O)₂—, —OC(O)N(R^(x))—,         —N(R^(x))C(O)N(R^(x)), —N(R^(x))S(O)₂N(R^(x))— or —OC(O)—; where         each R^(x), independently, is hydrogen or C₁₋₄ alkyl, and     -   R⁷ is hydrogen, C₁₋₆ aliphatic, 3-10-membered cycloaliphatic,         phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4         heteroatoms independently selected from nitrogen, oxygen, or         sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms         independently selected from nitrogen, oxygen, or sulfur; -   X is a bond or C₁₋₄ aliphatic; -   L¹ is —N(R⁸)C(O)—, —C(O)—N(R⁹)—, —N(R¹⁰)S(O)₂—, —S(O)₂NR¹¹—, —C(O)—,     —C(S)—, —S(O)₂—, —N(R′²)—, —O—C(O)—, —C(O)—O—, —O—S(O)₂—, —S(O)₂—O—,     —N(R¹³)C(O)N(R¹⁴)—, or —N(R¹⁵)S(O)₂N(R¹⁶)—; and wherein each of R⁸,     R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁴, R¹⁵, and R¹⁶, independently, is     hydrogen or C₁₋₄ alkyl; and X or L¹ can optionally join with R¹ to     form an optionally substituted 5-6-membered heterocyclyl or     optionally substituted 5-6-membered heteroaryl; -   R² is hydrogen or C₁₋₄ alkyl; -   L² is a bond, —C(O)—, —S(O)₂—, —C(O)—O—, —C(O)N(R^(y))—, or     —S(O)₂N(R^(y))—; wherein each R^(y), independently, is hydrogen or     C₁₋₄ alkyl; -   each occurrence of R⁴ and R⁵, independently, is —CN, halo or -L⁴-R¹⁷     wherein     -   L⁴ is C₁ alkylene, —O—, —N(R^(z))—, —S—, —S(O)—, —S(O)₂—,         —C(O)—, —CO₂—, —C(O)N(R^(z))—, —N(R^(z))C(O)—, —N(R^(z))C(O)O—,         —S(O)₂N(R^(z))—, —N(R^(z))S(O)₂—, —OC(O)N(R^(z))—,         —N(R^(z))C(O)N(R^(z))—, —N(R^(z))S(O)₂N(R^(z))— or —OC(O)—;         where each R^(z), independently, is hydrogen or C₁₋₄ alkyl, and -   R¹⁷ is hydrogen or C₁₋₆ aliphatic; and -   each of m and n, independently, is 0-3;     provided that (1) if one R⁴ is substituted at the ring carbon     between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is     substituted, X or L¹ can join with said R⁴ to form an optionally     substituted 5-7-membered heterocyclyl or an optionally substituted     5-6-membered heteroaryl; or (2) if one R⁴ is substituted at either     ring carbon adjacent to the ring nitrogen, said R⁴ can join with the     ring nitrogen to form an optionally substituted 5-7-membered     heterocyclyl or an optionally substituted 5-6-membered heteroaryl;     or (3) if L² is a bond and R³ is phenyl, naphthyl, or heteroaryl, R²     can join with a substituent of R³ to form an optionally substituted     5-7-membered heterocyclyl or an optionally substituted 5-6-membered     heteroaryl. Note that provisos (1), (2), and (3) are not exclusive     of each other.

In some embodiments, the invention provides a compound of formula I:

or a pharmaceutically acceptable salt thereof, wherein:

-   each of R¹ and R³, independently, is hydrogen, C₁₋₆ aliphatic,     3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered     heterocyclyl having 1-4 heteroatoms independently selected from     nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4     heteroatoms independently selected from nitrogen, oxygen or sulfur;     each of which being optionally substituted with 1-5 R⁶ wherein:     -   each R⁶ independently is —CN, halo or -L³-R⁷ wherein:         -   L³ is a bond, C₁₋₄ alkylene, —O—, —N(R^(x))—, —S—, —S(O)—,             —S(O)₂—, —C(O)—, —CO₂—, —C(O)NR^(x)—, —N(R^(x))C(O)—,             —N(R^(x))CO₂—, —S(O)₂NR^(x)—, —N(R^(x))S(O)₂—,             —OC(O)N(R^(x))—, —N(R^(x))C(O)N(R^(x)),             —N(R^(x))S(O)₂N(R^(x))— or —OC(O)—; where each R^(x),             independently, is hydrogen or C₁₋₄ alkyl, and         -   R⁷ is hydrogen, C₁₋₆ aliphatic, 3-10-membered             cycloaliphatic, phenyl, naphthyl, 3-10-membered heterocyclyl             having 1-4 heteroatoms independently selected from nitrogen,             oxygen, or sulfur, or 5-10-membered heteroaryl having 1-4             heteroatoms independently selected from nitrogen, oxygen, or             sulfur; -   X is a bond or C₁₋₄ aliphatic; -   L¹ is —N(R⁸)C(O)—, —C(O)—N(R⁹)—, —N(R¹⁰)S(O)₂—, —S(O)₂NR¹¹—, —C(O)—,     —S(O)₂—, —N(R′²)—, —O—C(O)—, —C(O)—O—, —O—S(O)₂—, —S(O)₂—O—,     —N(R¹³)C(O)N(R¹⁴)—, or —N(R¹⁵)S(O)₂N(R¹⁶)—; and wherein each of R⁸,     R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁴, R¹⁵, and R¹⁶, independently, is     hydrogen or C₁₋₄ alkyl; and X or L¹ can optionally join with R¹ to     form an optionally substituted 5-6-membered heterocyclyl or     optionally substituted 5-6-membered heteroaryl; -   R² is hydrogen or C₁₋₄ alkyl; -   L² is a bond, —C(O)—, —S(O)₂—, —C(O)—O—, —C(O)N(R^(y))—, or     —S(O)₂N(R^(y))—; wherein each R^(y), independently, is hydrogen or     C₁₋₄ alkyl; -   each occurrence of R⁴ and R⁵, independently, is —CN, halo or -L⁴-R¹⁷     wherein -   L⁴ is C₁ alkylene, —O—, —N(R^(z))—, —S—, —S(O)—, —S(O)₂—, —C(O)—,     —CO₂—, —C(O)N(R^(z))—, —N(R^(z))C(O)—, —N(R^(z))C(O)O—,     —S(O)₂N(R^(z))—, —N(R^(z))S(O)₂—, —OC(O)N(R^(z))—,     —N(R^(z))C(O)N(R^(z))—, —N(R^(z))S(O)₂N(R^(z))— or —OC(O)—; where     each R^(z), independently, is hydrogen or C₁₋₄ alkyl, and -   R¹⁷ is hydrogen or C₁₋₆ aliphatic; and -   each of m and n, independently, is 0-3; and

provided that if one R⁴ is substituted at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is substituted, X or L¹ can join with said R⁴ to form an optionally substituted 5-7-membered heterocyclyl or an optionally substituted 5-6-membered heteroaryl.

In some embodiments, R¹ is H. In other embodiments, R¹ is C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur; each of which is optionally substituted with 1-5 R⁶.

In other embodiments, R¹ is C₁₋₃ alkyl. In still other embodiments, R³ is C₁₋₆ aliphatic, 3-6-membered cycloaliphatic, phenyl, naphthyl, 3-6-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-6-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur.

In some embodiments, X or L¹ optionally joins with R¹ to form an optionally substituted 5-6-membered heterocyclyl or an optionally substituted 5-6-membered heteroaryl. In other embodiments, X joins with R¹ to form an optionally substituted 5-6-membered heterocyclyl. In other embodiments, L′ joins with R¹ to form an optionally substituted 5-6-membered heterocyclyl. In some embodiments, R¹ and R¹⁰ join together to form an optionally substituted 5-6-membered heterocyclyl. In other embodiments, X joins with R¹ to form an optionally substituted 5-6-membered heteroaryl. In other embodiments, L¹ joins with R¹ to form an optionally substituted 5-6-membered heteroaryl. In some embodiments, R¹ and R¹¹ join together to form an optionally substituted 5-6-membered heteroaryl. In each case mentioned above, said heterocyclyl and heteroaryl are as defined above (e.g., each can be optionally substituted as described above and e.g., each heteroaryl can contain heteroatom nitrogen, oxygen, or sulfur, including oxidized form of nitrogen or sulfur). In other embodiments, said 5-6-membered heterocyclyl or 5-6-membered heteroaryl is unsubstituted. In still other embodiments, said 5-6-membered heterocyclyl or 5-6-membered heteroaryl is substituted (e.g., comprises 1, 2, 3, 4, or 5 substituent groups such as those described for R⁶ herein); in some embodiments, said substituents are independently -halo, —CN, —C₁₋₆ aliphatic, —OH, and —O—(C₁₋₆ aliphatic). In certain embodiments, two substituent groups of said 5-6-membered heterocyclyl or 5-6-membered heteroaryl combine to form an optionally substituted phenyl group or an optionally substituted 5-6-membered heteroaryl group.

In some embodiments, R¹ is C₁₋₄ alkyl, 3-6-membered cycloaliphatic, phenyl, naphthyl, 3-6-membered heterocyclyl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-6-membered heteroaryl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur.

In some embodiments, R¹ is a C₁₋₆ aliphatic. In other embodiments, R¹ is a C₁₋₆ alkyl. In certain embodiments, R¹ is methyl, ethyl, n-propyl, isopropyl, n-butyl, iso-butyl, tert-butyl, n-pentyl, isopentyl, or n-hexyl.

In other embodiments, R¹ is methyl, cyclohexyl, pyridyl, phenyl, or naphthyl.

In some embodiments, R¹ is a C₁₋₆ aliphatic comprising a substituent that is ═NH and/or a substituent that is —NH₂. In some embodiments, R¹ is methyl substituted with ═NH and —NH₂.

In other embodiments, R¹ is

In other embodiments, R¹ is

In other embodiments, R¹ is

In some embodiments, R¹ is a 3-, 4-, 5-, or 6-membered cycloaliphatic. In other embodiments, R¹ is a 5-to-10-membered bridged cycloaliphatic. In other embodiments, R¹ is a 3-, 4-, 5-, or 6-membered heterocyclyl having 1-4, 1-3, or 1-2 heteroatoms independently selected form nitrogen, oxygen, or sulfur. In other embodiments, R¹ is a 5-6-membered heteroaryl. In other embodiments, R¹ is phenyl. In other embodiments, R¹ is naphthyl.

In certain embodiments, R¹ is unsubstituted. In other embodiments, R¹ is substituted with 1, 2, 3, 4, or 5 R⁶ as described herein. In some embodiments, R¹ is optionally substituted with 1-3 R⁶ wherein each R⁶ independently is halo or -L³-R⁷. In some embodiments, L³ is a bond, C₁₋₃alkylene, —O—, or —N(R^(x))—. In other embodiments, R⁷ is hydrogen, 3-6-membered cycloaliphatic, phenyl, 3-6-membered heterocyclyl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-6-membered heteroaryl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur. In other embodiments, R¹ is optionally substituted with 1-3 R⁶, wherein each R⁶ independently is fluoro, chloro, C₁₋₄ aliphatic, trifluoromethyl, hydroxyl or —O—C₁₋₄ aliphatic.

In other embodiments, R¹ is optionally substituted cyclopropyl, methyl, ethyl, isopropyl, —(CH₂)₂OCH₂CH₃, optionally substituted phenyl (e.g., 2,4-difluorophenyl, 2,4-dichlorophenyl, 4-ethylphenyl, 2-methoxy-4-fluorophenyl, 3,4-difluorophenyl, 2,3-difluorophenyl, 2-trifluoromethylphenyl, 3-tert-butylphenyl, 2-methoxyphenyl, 3-methoxyphenyl, 2-fluoro-4-methylphenyl, 4-trifluoromethylphenyl, 3-trifluoromethylphenyl, 2,4-dimethylphenyl, 2,5-dimethylphenyl, 2,5-dichlorophenyl, 2-methoxy-4-methylphenyl, 2-chloro-4-methylphenyl, 2-fluoro-4-methylphenyl, 2-fluoro-4-trifluoromethylphenyl, 2,6-difluorophenyl, 4-chlorophenyl, 3-fluorophenyl, 2,5-difluoro-4-methoxyphenyl, or 4-(optionally substituted pyridyl)-phenyl), optionally substituted naphthyl, 3-fluorophenyl, optionally substituted pyrrolidyl, optionally substituted γ-sultam, optionally substituted piperidyl, optionally substituted piperizinyl, optionally substituted tetrahydrofuryl, optionally substituted morpholino, optionally substituted pyrrazolyl, optionally substituted imidazolyl, optionally substituted thienyl, optionally substituted oxazolyl, optionally substituted pyridyl, optionally substituted pyridazinyl, bicyclo[1.1.1]pentyl, —CH₂-(optionally substituted phenyl), —CH₂CH₂-(optionally substituted phenyl), —CH₂-(optionally substituted naphthyl), —CH₂-(optionally substituted pyridyl), optionally substituted bipyridyl, or —CH₂-(optionally substituted cyclopropyl). In some embodiments, R¹ is selected from those depicted in Table 1, below.

In some embodiments, R³ is H. In other embodiments, R³ is C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur; each of which is optionally substituted with 1-5 R⁶. In other embodiments, R³ is C₁₋₃ alkyl. In still other embodiments, R³ is C₁₋₆ aliphatic, 3-6-membered cycloaliphatic, phenyl, naphthyl, 3-6-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-6-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur.

In some embodiments, R³ is C₁₋₃ aliphatic, C₃₋₆ cycloaliphatic, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, said cycloaliphatic or heteroaryl being optionally substituted with 1-5 R⁶.

In other embodiments, R³ is methyl, cyclopropyl, or 6-membered heteroaryl that is optionally substituted with 1-2 R⁶.

In further embodiments, R³ is 4-pyrimidinyl comprising optional substituents independently selected from methyl, methoxy, cyano, trifluoromethyl, and cyclopropyl (e.g., comprising 1, 2, or 3 optionally substituents independently selected from methyl, methoxy, cyano, trifluoromethyl, and cyclopropyl).

In some embodiments, R³ is C₁₋₃ aliphatic. In other embodiments, R³ is C₁₋₃ alkyl (e.g., methyl, ethyl, n-propyl, or iso-propyl). In other embodiments, R³ is methyl.

In other embodiments, R³ is C₃₋₆ cycloaliphatic (e.g., cyclopropyl).

In other embodiments, R³ is 5-10-membered heteroaryl (e.g., 6-membered heteroaryl) having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur. In other embodiments, R³ is pyridinyl, pyrimidinyl, pyrazolyl, imidazolyl, benzoxazolyl, benzthiazolyl, 1,8-naphthyridinyl, quinolinyl, or isoquinolinyl. In other embodiments, R³ is pyridyl or pyrimidinyl.

In some embodiments, R³ is pyridinyl, pyrimidinyl, pyrazolyl, imidazolyl, benzoxazolyl, benzthiazolyl, 1,8-naphthyridinyl, quinolinyl, or isoquinolinyl; each of which being optionally substituted with C₁₋₆ aliphatic, C₁₋₆alkoxy, or cyano.

In certain embodiments, R³ is unsubstituted. In other embodiments, R³ is substituted with 1, 2, 3, 4, or 5 (e.g., 1 or 2) R⁶ as described herein. For example, R⁶ is C₁₋₆ aliphatic (e.g., methyl or trifluoromethyl), C₁₋₆alkoxy (e.g., methoxy), cyano, or cyclopropyl.

In certain embodiments, R³ is

In some embodiments, R³ is selected from those depicted in Table 1, below.

In some embodiments, each R⁶ independently is halo or -L³-R⁷.

In some embodiments, L³ is a bond. In other embodiments, L³ is C₁₋₄ alkylene, —O—, —N(R^(x))—, —S—, —S(O)—, —S(O)₂—, —C(O)—, —CO₂—, —C(O)NR^(x)—, —N(R^(x))C(O)—, —N(R^(x))CO₂—, —S(O)₂NR^(x)—, —N(R^(x))S(O)₂—, —OC(O)N(R^(x))—, —N(R^(x))C(O)N(R^(x)), —N(R^(x))S(O)₂N(R^(x))— or —OC(O)—. In still other embodiments, L³ is a bond, C₁₋₃ alkylene, —O—, or —N(R^(x))—.

In some embodiments, R^(x) is hydrogen. In other embodiments, R^(x) is unsubstituted C₁₋₄ alkyl. In other embodiments, R^(x) is substituted C₁₋₄ alkyl. In some embodiments, the substituent groups are selected from the exemplary substituent groups described herein for aliphatic groups; optionally, said substituted C₁₋₄ alkyl has 1, 2, 3, 4, or 5 substituents. In some embodiments, said alkyl includes a substituent selected from: a 3-, 4-, 5-, or 6-membered cycloaliphatic; 3-, 4-, 5-, or 6-membered heterocyclyl, —OH, —O—(C₁₋₆ aliphatic), optionally substituted amino, and -halo.

In other embodiments, R⁷ is hydrogen. In other embodiments, R⁷ is C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur. In still other embodiments, R⁷ is hydrogen, 3-6-membered cycloaliphatic, phenyl, 3-6-membered heterocyclyl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-6-membered heteroaryl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur. In some embodiments, R⁷ is unsubstituted. In some embodiments, the substituent groups are selected from the exemplary substituent groups described herein for aliphatic, cycloaliphatic, heterocyclyl, heteroaryl, and aryl moieties. For clarity, optional substituents for aryl also apply to phenyl and naphthyl. Optionally, said R⁷ has 1, 2, 3, 4, or 5 substituents. In some embodiments, the substituent groups are selected from C₁₋₆ alkyl, —OH, optionally substituted amino, halo, and —O—(C₁₋₆ aliphatic).

In some embodiments, each R⁶ independently is halo or -L³-R¹ wherein L³ is a bond, C₁₋₃ alkylene, —O—, or —N(R^(x))— and R⁷ is hydrogen, 3-6-membered cycloaliphatic, phenyl 3-6-membered heterocyclyl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-6-membered heteroaryl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur.

In other embodiments, each R⁶ independently is fluoro, chloro, C₁₋₄ aliphatic, trifluoromethyl, hydroxyl or —O—C₁₋₄ aliphatic. In some embodiments, R⁶ is selected from those depicted in Table 1, below.

In some embodiments, X is a bond. In other embodiments, X is C₁₋₄ alkylene. In still other embodiments, X is methylene or ethylene. In some embodiments, X is selected from those depicted in Table 1, below.

In some embodiments, when one R⁴ is substituted at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is substituted, X joins with said R⁴ to form an optionally substituted 5-7-membered (e.g., 5-6-membered) heterocyclyl or an optionally substituted 5-6-membered heteroaryl. Said heterocyclyl and heteroaryl are as defined above (e.g., each can be optionally substituted as described above and e.g., each heteroaryl can contain heteroatom nitrogen, oxygen, or sulfur, including oxidized form of nitrogen or sulfur). In some embodiments, X joins with said R⁴ to form an optionally substituted pyrazolyl, imidazolyl, pyrrolyl, triazolyl, oxazolyl, or thiazolyl. In other embodiments, X joins with said R⁴ to form any of the embodiments in Table 1, below.

In other embodiments, X joins with R¹ to form an optionally substituted 5-6-membered heterocyclyl or 5-6-membered heteroaryl. In still other embodiments, X joins with R¹ to form an optionally substituted 5-6-membered heterocyclyl. In certain embodiments, X joins with R¹ to form an optionally substituted 5-6-membered heteroaryl. In each case mentioned above, said heterocyclyl and heteroaryl are as defined above (e.g., each can be optionally substituted as described above and e.g., each heteroaryl can contain heteroatom nitrogen, oxygen, or sulfur, including oxidized form of nitrogen or sulfur). In other embodiments, said 5-6-membered heterocyclyl or 5-6-membered heteroaryl is unsubstituted. In still other embodiments, said 5-6-membered heterocyclyl or 5-6-membered heteroaryl is substituted (e.g., comprises 1, 2, 3, 4, or 5 substituent groups such as those described for R⁶ herein); in some embodiments, said substituents are independently -halo, —CN, —C₁₋₆ aliphatic, —OH, and —O(C₁₋₆ aliphatic). In certain embodiments, two substituent groups of said 5-6-membered heterocyclyl or 5-6-membered heteroaryl combine to form an optionally substituted phenyl group or an optionally substituted 5-6-membered heteroaryl group. In other embodiments, X joins with said R¹ to form any of the embodiments in Table 1, below.

In some embodiments, L¹ is —N(R⁸)C(O)—, —N(R¹⁰)S(O)₂—, —C(O)—, or —S(O)₂—. In some embodiments, L¹ is —N(R⁸)C(O)—, —N(R¹⁰)S(O)₂—, —C(O)—, or —S(O)₂—. In some embodiments, L¹ is —N(R¹⁰)S(O)₂—. In other embodiments, any of R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁴, R¹⁵ and R¹⁶, independently, is hydrogen. In still other embodiments, any of R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁴, R¹⁵ and R¹⁶, independently, is C₁₋₄alkyl. In certain embodiments, each of R⁸ and R¹⁰, independently, is hydrogen, methyl or ethyl. In other embodiments, R¹⁰ is hydrogen, methyl or ethyl. In other embodiments, any of R⁸, R⁹, R¹⁰, R¹¹, R¹², R¹³, R¹⁴, R¹⁵ and R¹⁶, independently, is selected from those depicted in Table 1, below.

In further embodiments, L¹ is —N(R¹⁰)S(O)₂—, and R¹⁰ is hydrogen, methyl or ethyl.

In certain embodiments, L¹ joins with R¹ to form an optionally substituted 5-6-membered heterocyclyl or optionally substituted 5-6-membered heteroaryl. In certain embodiments, L¹ joins with R¹ to form an optionally substituted 5-6-membered heterocyclyl. In certain embodiments, L¹ joins with R¹ to form an optionally substituted 5-6-membered heteroaryl. In some embodiments, R¹⁰ and R¹ join together to form an optionally substituted 5-6-membered heterocyclyl. In some embodiments, R¹¹ and R¹ join together to form an optionally substituted 5-6-membered heteroaryl. In each case mentioned above, said heterocyclyl and heteroaryl are as defined above (e.g., each can be optionally substituted as described above and e.g., each heteroaryl can contain heteroatom nitrogen, oxygen, or sulfur, including oxidized form of nitrogen or sulfur). In other embodiments, said 5-6-membered heterocyclyl or 5-6-membered heteroaryl is unsubstituted. In still other embodiments, said 5-6-membered heterocyclyl or 5-6-membered heteroaryl is substituted (e.g., comprises 1, 2, 3, 4, or 5 substituent groups such as those described for R⁶ herein); in some embodiments, said substituents are independently -halo, —CN, —C₁₋₆ aliphatic, —OH, and —O—(C₁₋₆ aliphatic). In certain embodiments, two substituent groups of said 5-6-membered heterocyclyl or 5-6-membered heteroaryl combine to form an optionally substituted phenyl group or an optionally substituted 5-6-membered heteroaryl group.

In some embodiments, when one R⁴ is substituted at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is substituted, L¹ joins with said R⁴ to form an optionally substituted 5-6-membered heterocyclyl or an optionally substituted 5-6-membered heteroaryl. In some embodiments, L¹ joins with said R⁴ to form an optionally substituted pyrazolyl, imidazolyl, pyrrolyl, triazolyl, oxazolyl, or thiazolyl. In other embodiments, X is a bond.

In some embodiments, R² is hydrogen. In other embodiments, R² is C₁₋₄ alkyl (e.g., methyl, ethyl, or cyclopropylmethyl). In certain embodiments, R² is hydrogen, methyl, ethyl, or cyclopropylmethyl. In some embodiments, R² is selected from those depicted in Table 1, below.

In some embodiments, L² is a bond. In some embodiments, when L² is a bond and R³ is phenyl, naphthyl, or heteroaryl (e.g., pyridinyl or pyrimidinyl), R² can join with a substituent of R³ to form an optionally substituted 5-7-membered heterocyclyl (e.g., piperidinyl or piperazinyl) or an optionally substituted 5-6-membered heteroaryl (e.g., imidazolyl, pyrazolyl, or pyridinyl). In other embodiments, L² is —C(O)—, —S(O)₂—, —C(O)—O—, —C(O)N(R^(y))—, or —S(O)₂N(R^(y))—. In other embodiments, L² is —C(O)— or —C(O)—O—. In certain embodiments, L² is —C(O)—. In other embodiments, L² is a bond, —C(O)— or —C(O)—O—. In still other embodiments, L² is a bond or —C(O)—. In some embodiments, L² is selected from those depicted in Table 1, below.

In other embodiments, any R^(y) is hydrogen. In some embodiments, any R^(y) is C₁₋₄ alkyl. In some embodiments, R^(y) is selected from those depicted in Table 1, below.

In some embodiments, m is 0. In other embodiments, m is 1, 2, or 3. In other embodiments, m is 0, 1, or 2 (e.g., m is 1 or 2). For clarity, it is understood that when m is 1, 2, or 3, the R⁴ groups may be located at any position of the pyridyl ring having the —X-L¹-R¹ moiety. That is, any R⁴ can be located at either carbon ortho to the pyridyl nitrogen, as well as the carbon para to the pyridyl nitrogen.

In some embodiments, R⁴ is —CN, halo or -L⁴-R¹⁷. In some embodiments, R⁴ is halo or -L⁴-R¹⁷.

In some embodiments, R⁴ is substituted at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is substituted. In certain embodiments' X or L¹ joins with said R⁴ to form an optionally substituted 5-7-membered heterocyclyl or 5-6-membered heteroaryl. In other embodiments, X joins with said R⁴ to form an optionally substituted 5-7-membered heterocyclyl. In other embodiments, X joins with said R⁴ to form an optionally substituted 5-6-membered heteroaryl. In other embodiments, L¹ joins with said R⁴ to form an optionally substituted 5-7-membered heterocyclyl. In other embodiments, L¹ joins with said R⁴ to form an optionally substituted 5-6-membered heteroaryl. In each case mentioned above, said heterocyclyl and heteroaryl are as defined above (e.g., each can be optionally substituted as described above and e.g., each heteroaryl can contain heteroatom nitrogen, oxygen, or sulfur, including oxidized form of nitrogen or sulfur). In other embodiments, said 5-7-membered heterocyclyl or 5-6-membered heteroaryl is unsubstituted. In still other embodiments, said 5-7-membered heterocyclyl or 5-6-membered heteroaryl is substituted (e.g., comprises 1, 2, 3, 4, or 5 substituent groups such as those described for R⁶ herein); in some embodiments, said substituents are independently -halo, —CN, —C₁₋₆ aliphatic, —OH, and —O—(C₁₋₆ aliphatic). In certain embodiments, two substituent groups of said 5-6-membered heterocyclyl or 5-6-membered heteroaryl combine to form an optionally substituted phenyl group or an optionally substituted 5-6-membered heteroaryl group.

In other embodiments, R⁴ is substituted at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is substituted, and a second R⁴ is substituted at the para position with respect to the ring nitrogen.

In other embodiments, R⁴ is halo or -L⁴-R¹⁷. In still other embodiments, L⁴ is C₁₋₄alkylene chain, —O—, or —N(R^(z))—. In some embodiments, R⁴ is independently halo or C₁₋₃ alkyl. In some embodiments, R^(z) is hydrogen. In other embodiments, R^(z) is C₁₋₄ alkyl. In further embodiments, R^(z) is hydrogen or methyl. In some embodiments, R¹⁷ is hydrogen. In other embodiments, R¹⁷ is C₁₋₆ aliphatic. In still other embodiments, R¹⁷ is hydrogen or C₁₋₃ alkyl. In other embodiments, R⁴ is fluoro, chloro, C₁₋₃ alkyl, trifluoromethyl, hydroxyl, —NH₂ or —NH—C₁₋₃ alkyl. In still other embodiments, R⁴ is fluoro, chloro, unsubstituted C₁₋₃ aliphatic, trifluoromethyl, hydroxyl, methoxy, —NH₂ or —NH—C₁₋₃ aliphatic. In some embodiments, R⁴ is selected from those depicted in Table 1, below. In further embodiments, m is 0-2. In some embodiments, one R⁴ is substituted at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is substituted. In still other embodiments, m is 2 and a second R⁴ is substituted at the para position with respect to the ring nitrogen. In certain embodiments, each of the two R⁴ (i.e., the R⁴ that is substituted at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is attached, and the second R⁴ substituted at the para position with respect to the ring nitrogen is independently fluoro, chloro, or methyl. In a further embodiment, said second R⁴ is fluoro, chloro, methyl, or methoxy.

In some embodiments, n is 0. In other embodiments, n is 1, 2, or 3. In other embodiments, n is 0, 1, or 2. For clarity, it is understood that when n is 1, 2, or 3, the R⁵ groups may be located at any position of the pyridyl ring having the —NR²-L²-R³ moiety. That is, any R⁵ can be located at either carbon meta to the pyridyl nitrogen, as well as the carbon ortho to the pyridyl nitrogen.

In some embodiments, R⁵ is halo or -L⁴-R¹⁷ wherein L⁴ is C₁₋₄alkylene chain, —O—, or —N(R^(a))— where R^(a) is hydrogen or methyl, and R¹⁷ is hydrogen or C₁₋₃ alkyl. In some embodiments, R⁵ is selected from those depicted in Table 1, below.

In certain embodiments,

-   X is a bond; -   L¹ is —N(R⁸)C(O)—, —N(R¹⁰)S(O)₂—, —C(O)—, or —S(O)₂— (e.g., L¹ is     —N(R⁸)C(O)—, —N(R¹⁰)S(O)₂—, or —S(O)₂—); -   R² is hydrogen, methyl, ethyl, or cyclopropylmethyl; -   L² is a bond, —C(O)— or —C(O)—O—; -   R³ is C₁₋₃ alkyl, cyclopropyl, or 6-membered heteroaryl (e.g., R³ is     C₁₋₃ alkyl), each of which being optionally substituted with 1-2 R⁶; -   R⁴ is fluoro, chloro, C₁₋₃ alkyl, trifluoromethyl, hydroxyl,     methoxy, —NH₂ or —NH—C₁₋₃ aliphatic (e.g., R⁴ is fluoro, chloro,     C₁₋₃ alkyl, trifluoromethyl, hydroxyl, —NH₂ or —NH—C₁₋₃ alkyl); -   m is 0-2 (e.g., m is 1 or 2); -   R⁴ is substituted at the ring carbon between the ring nitrogen and     the ring carbon to which -L¹-R¹ is substituted; -   n is 0 or 1; and -   R¹ is

In some embodiments, m is 1 and R⁴ is substituted at the ring carbon between the ring nitrogen and the ring carbon to which -L¹-R¹ is substituted. In some embodiments, m is 2 and one R⁴ is substituted at the ring carbon between the ring nitrogen and the ring carbon to which -L¹-R¹ is substituted whereas the other R⁴ is substituted at the para position with respect to the ring nitrogen.

In some embodiments, L¹ is —N(R⁸)C(O)— or —N(R¹⁰)S(O)₂— where each of R⁸ and R¹⁰, independently, optionally join with R⁴ to form an optionally substituted 5-7-membered heterocyclyl.

In other embodiments, L¹ is —N(R⁸)C(O)— or —N(R¹⁰)S(O)₂— where each of R⁸ and R¹⁰, independently, is hydrogen, methyl, or ethyl; R¹ is C₁₋₄ alkyl, phenyl, naphthyl 3-6-membered cycloaliphatic, 3-6-membered heterocyclyl having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 5-6-membered heteroaryl having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur; R³ is C₁₋₃ alkyl; and R⁴ is halo or -L⁴-R¹⁷ wherein L⁴ is C₁₋₄ alkylene chain, —O—, or —N(R^(z))— where R^(z) is hydrogen or methyl, and R¹⁷ is hydrogen or C₁₋₃ alkyl. In some embodiments, R⁴ is methyl, ethyl, fluoro, chloro, —NH₂, methoxy, or ethoxy.

In other embodiments, L¹ is —C(O)— and R¹ is

In some embodiments, the compound of formula I has a structure according to any of formulas I-A to I-Y as shown below:

or a pharmaceutically acceptable salt thereof, wherein L², R^(x), R¹, R³, R⁴, R⁵, R⁶, R⁷, R⁹, R¹⁰, R¹¹, m, and n are as described herein.

In other embodiments, the compound of formula I has a structure according to formula II,

or a pharmaceutically acceptable salt thereof, where R¹, L¹, R³, R⁴, and m are as defined herein, wherein (m-1)≧0. In some embodiments, (m-1) is 0 or 1.

In some embodiments, (m-1) is 0. When (m-1) is 0, the pyridyl moiety comprises only the one R⁴ group shown as shown in Formula II-a;

That is, there is only one R⁴ and it is substituted at the ring carbon between the ring nitrogen and the ring carbon to which -L¹-R¹ is substituted.

In other embodiments, (m-1) is 1. That is, there are two R⁴ and a first one is substituted at the ring carbon between the ring nitrogen and the ring carbon to which -L¹-R¹ is substituted whereas the other R⁴ is substituted either at the para or ortho position with respect to the ring nitrogen as shown in Formulas II-b and II-c,

In further embodiments, the R⁴ substituted at the para position with respect to the ring nitrogen is methyl. In still other embodiments, L¹ is —N(R¹⁰)S(O)₂—.

In still other embodiments, the compound of formula I has a structure according to any of formulas III, IV, IV′, V, VI, and VI′:

or a pharmaceutically acceptable salt thereof, where R³, R⁴, and R⁶ are as defined herein. In some embodiments, each R⁴ is independently —NH₂, halo (e.g., F or Cl), optionally substituted C₁₋₃ alkyl, or —O-(optionally substituted C₁₋₃ alkyl). In other embodiments, each R⁶ is independently halo (e.g., F or Cl), optionally substituted C₁₋₃ alkyl, or —O-(optionally substituted C₁₋₃ alkyl). In some embodiments, both R⁶ are Cl. In other embodiments, both R⁶ are F. In some embodiments, one R⁶ is F and the other R⁶ is Cl. In other embodiments, R³ is optionally substituted C₁₋₃ alkyl.

In still other embodiments, the compound of formula I has a structure according to formula VII

or a pharmaceutically acceptable salt thereof, where R¹, R⁴, R³, and R¹⁶ are as defined herein. In some embodiments, R¹ and R¹⁶ are each optionally substituted C₁₋₄ alkyl.

In other embodiments, the compound of formula I has a structure according to formula VIII,

or a pharmaceutically acceptable salt thereof, where (m-1) is 0 or 1 and R¹, L¹, R⁴, and R⁶ are as defined herein.

In other embodiments, L¹ is —C(O)— and R¹ is

where p is 1-4. Further, R¹ can be substituted with 1-2 R⁶ where R⁶ is C₁₋₄ alkyl (e.g., methyl) or halo (e.g., fluoro). In other embodiments, R⁴ is halo or -L⁴-R¹⁷ wherein L⁴ is C₁₋₄alkylene, —O—, or —N(R^(z))— where R^(z) is hydrogen or methyl, and R¹⁷ is hydrogen or C₁₋₃ aliphatic. For example, R⁴ is methyl, ethyl, fluoro, chloro, —NH₂, methoxy, or ethoxy. In other embodiments, R⁶ is cyano, fluoro, chloro, C₁₋₆ alkyl (e.g., methyl), 3-6-membered cycloalkyl, or phenyl.

In other embodiments, (m-1) is 0. That is, there is only one R⁴ and it is substituted at the ring carbon between the ring nitrogen and the ring carbon to which -L¹-R¹ is substituted as shown in Formula VIII-A,

In other embodiments, (m-1) is 1. That is, there are two R⁴ and a first one is substituted at the ring carbon between the ring nitrogen and the ring carbon to which -L¹-R¹ is substituted whereas a second R⁴ is substituted either at the para (see Formula VIII-B) or ortho position (see Formula VIII-C) with respect to the ring nitrogen,

In some embodiments, the second R⁴ is substituted at the para position with respect to the ring nitrogen. In some embodiments, the second R⁴ is methyl.

In still other embodiments, the compound of formula I has a structure according to any of formulas VIII-D to VIII-O

or a pharmaceutically acceptable salt thereof, where R^(x), R¹, R⁴, m, and R⁶ are as described herein.

The present invention also provides compounds of formulas A and B:

where R¹, L¹, X, R⁴, m, R⁵, n, L², R², and R³ are as defined herein and one of V and W is a halide group (e.g., bromo) or pseudohalide group (e.g., cyanide) and the other is a boronic acid or a derivative. For example, V can be bromo or iodo and W can be —B(OR_(a))(OR_(b)) where each of R_(a) and R_(b) is independently hydrogen or C₁₋₃ alkyl, and R_(a) and R_(b) can join together to form an optionally substituted 5-6 membered heterocyclyl (together with B and O).

In some embodiments, the invention provides a composition comprising a compound according to formula A and a compound according to formula B.

The present invention also provides a method of coupling a compound of formula A to a compound of formula B to form a compound of formula I. The method comprises reacting a compound of formula A with a compound of formula B in the presence of a palladium catalyst (e.g., Pd(PPh₃)₃, Pd(dppf)Cl₂, or Pd₂(dba)₃) and a base (potassium carbonate or sodium carbonate) in an appropriate solvent (e.g., dioxane or THF).

Exemplary compounds of the present invention are set forth in Table 1, below.

TABLE 1 Exemplary Compounds

I-1

I-2

I-3

I-4

I-5

I-6

I-7

I-8

I-9

I-10

I-11

I-12

I-13

I-14

I-15

I-16

I-17

I-18

I-19

I-20

I-21

I-22

I-23

I-24

I-25

I-26

I-27

I-28

I-29

I-30

I-31

I-32

I-33

I-34

I-35

I-36

I-37

I-38

I-39

I-40

I-41

I-42

I-43

I-44

I-45

I-46

I-47

I-48

I-49

I-50

I-51

I-52

I-53

I-54

I-55

I-56

I-57

I-58

I-59

I-60

I-61

I-62

I-63

I-64

I-65

I-66

I-67

I-68

I-69

I-70

I-71

I-72

I-73

I-74

I-75

I-76

I-77

I-78

I-79

I-80

I-81

I-82

I-83

I-84

I-85

I-86

I-87

I-88

I-89

I-90

I-91

I-92

I-93

I-94

I-95

I-96

I-97

I-98

I-99

I-100

I-101

I-102

I-103

I-104

I-105

I-106

I-107

I-108

I-109

I-110

I-111

I-112

I-113

I-114

I-115

I-116

I-117

I-118

I-119

I-120

I-121

I-122

I-123

I-124

I-125

I-126

I-127

I-128

I-129

I-130

I-131

I-132

I-133

I-134

I-135

I-136

I-137

I-138

I-139

I-140

I-141

I-142

I-143

I-144

I-145

I-146

I-147

I-148

I-149

I-150

I-151

I-152

I-153

I-154

I-155

I-156

I-157

I-158

I-159

I-160

I-161

I-162

I-163

I-164

I-165

I-166

I-167

I-168

I-169

I-170

I-171

I-172

I-173

I-174

I-175

I-176

I-177

I-178

I-179

I-180

I-181

I-182

I-183

I-184

I-185

I-186

I-187

I-188

I-189

I-190

I-191

I-192

I-193

I-194

I-195

I-196

I-197

I-198

I-199

I-200

I-201

I-202

I-203

I-204

I-205

I-206

I-207

I-208

I-209

I-210

I-211

I-212

I-213

I-214

I-215

I-216

I-217

I-218

I-219

I-220

I-221

I-222

I-223

I-224

I-225

I-226

I-227

I-228

I-229

I-230

I-231

I-232

I-233

I-234

I-235

I-236

I-237

I-238

I-239

I-240

I-241

I-242

I-243

I-244

I-245

I-246

I-247

I-248

I-249

I-250

I-251

I-252

I-253

I-254

I-255

I-256

I-257

I-258

I-259

I-260

I-262

I-263

I-264

I-265

I-266

I-267a (Chiral Sep Peak1)

I-267b (Chiral Sep Peak2)

I-268

I-269

I-271

I-272

I-273

I-274

I-275

I-276

I-277

I-278

I-279

I-280

I-281

I-282

I-283

I-284

I-285

I-286

I-287

I-288

I-289

I-290

I-291

I-292

I-293

I-294

I-295

I-296

I-297

I-298

I-299

I-300

I-301

I-302

I-303

I-304

I-305

I-306

I-307

I-308

I-309

I-310

I-311

I-312

I-313

I-314

I-315

I-318

I-319

I-320

I-321

I-322

I-323

I-324

I-325

I-326

I-329

I-330

I-331

I-332

I-333

I-334

I-335

I-336

I-337

I-338

I-339

I-340

I-341

I-342

I-343

I-344

I-346

I-347

I-348

I-349

I-350

I-352

I-353

I-354

I-355

I-356

I-357

I-358

I-359

I-361

I-362

I-363

I-364

I-365

I-366

I-367

I-368

I-369

I-370

I-371

I-372

I-373

I-374

I-375

I-376

I-377

I-378

I-379

I-380

I-381

I-382

I-383

I-384

I-386

I-387

I-388

I-389

I-390

I-391

I-392

I-394

I-395

I-396

I-397

I-398

I-399

I-401

I-402

I-403

I-404

I-405

I-406

I-407

I-408

I-409

I-410

I-411

I-412

I-413

I-414

I-415

I-416

I-417

I-418

I-419

I-420

I-421

I-422

I-423

I-424

I-425

I-426

I-427

I-428

I-429

I-430

I-431

I-432

I-433

I-434

I-435

I-436

I-437

I-438

I-439

I-440

I-441

I-442

I-443

I-444

I-445

I-446

I-447

I-448

I-449

I-450

I-452

I-454

I-455

I-456

I-457

I-458

I-459

I-460

I-462

I-463

I-464

I-465

I-466

I-467

I-468

I-469

I-470

I-471

I-472

I-473

I-474

I-475

I-476

I-477

I-478

I-479

I-480

I-481

I-482

I-483

I-484

I-485

I-486

I-487

I-488

I-490

I-491

I-492

I-493

I-494

I-495

I-496 (peak 1)

I-497 (peak 2)

I-498 (peak 1)

I-499 (peak 2)

In certain embodiments, the present invention provides a compound depicted in Table 1, above, or a pharmaceutically acceptable salt thereof. In other embodiments, the compound is I-30, I-32, 1-41, I-94, I-153, I-214, I-218, I-225, I-237, I-246, I-291, I-292, I-293, I-294, I-296, I-299, I-304 or I-308 or a pharmaceutically acceptable salt thereof. In other embodiments, the compound is I-41, I-94, I-153, I-299, or I-308 or a pharmaceutically acceptable salt thereof.

The compounds of Table 1 above may also be identified by the chemical names provided in Table 2. This table also references exemplary synthetic protocols that can be used to prepare the indicated compound.

TABLE 2 Chemical Names and Synthetic Protocols Synthetic Compound Example Chemical Name I-1 9V N-[6-methyl-5-({[6-(trifluoromethyl)pyridin-3- yl]sulfonyl}amino)-3,4′-bipyridin-2′-yl]acetamide I-2 23 N-{4-[-(cyclopropylsulfonyl)-1H-pyrazolo[4,3- b]pyridin-6-yl]pyridin-2-yl}acetamide I-3 7C N-{6-amino-5-[(2-naphthylmethyl)sulfonyl]-3,4′- bipyridin-2′-yl{acetamide I-4 9AV N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-5′,6- dimethyl-3,4′-bipyridin-2′- yl)cyclopropanecarboxamide I-5 5C N-{6-amino-5-[(4-methylpiperazin-1-yl)sulfonyl]- 3,4′-bipyridin-2′-yl}acetamide I-6 7H N-[6-amino-5-(benzylsulfonyl)-3,4′-bipyridin-2′- yl]acetamide I-7 5R N-[6-amino-5-(isopropylsulfamoyl)-3,4′-bipyridin- 2′-yl]acetamide I-8 15 N-[5-(cyclopropylcarbonyl)-3,4′-bipyridin-2′- yl]acetamide I-9 5AM N-{5-[(4,4-difluoropiperidin-1-yl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-10 20E N-[6-amino-5-(piperidin-1-ylcarbonyl)-3,4′- bipyridin-2′-yl]acetamide I-11 5AK N-[6-amino-5-(bicyclo[1.1.1]pent-1-ylsulfamoyl)- 3,4′-bipyridin-2′-yl]acetamide I-12 9AK N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-3,4′- bipyridin-2′-yl)acetamide I-13 21 N-(2′-acetamido-3,4′-bipyridin-5-yl)benzamide I-14 20K 2′-acetamido-6-amino-N-(cyclopropylmethyl)-3,4′- bipyridine-5-carboxamide I-15 20F N-[6-amino-5-(pyrrolidin-1-ylcarbonyl)-3,4′- bipyridin-2′-yl]acetamide I-16 9AP (rac)-N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)-2,2- difluorocyclopropanecarboxamide I-17 8K N-[4-(1H-pyrrolo[3,2-b]pyridin-6-yl)pyridin-2- yl]acetamide I-18 10G N-[6-methyl-5-({[1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl]sulfonyl}amino)-3,4′-bipyridin-2′- yl]acetamide I-19 5Q N-{6-amino-5-[(pyridin-3-ylmethyl)sulfamoyl]- 3,4′-bipyridin-2′-yl}acetamide I-20 11A N-{5-[methyl(methylsulfonyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-21 25 N-[4-(2-methyl-1,1-dioxido-3,4-dihydro-2H- pyrido[2,3-e][1,2,4]thiadiazin-7-yl)pyridin-2- yl]acetamide I-22 20V 2′-acetamido-N,N-dimethyl-6-(methylamino)-3,4′- bipyridine-5-carboxamide I-23 8B N-{4-[1-(phenylsulfonyl)-1H-pyrrolo[3,2- b]pyridin-6-yl]pyridin-2-yl}acetamide I-24 5L N-[6-amino-5-(morpholin-4-ylsulfonyl)-3,4′- bipyridin-2′-yl]acetamide I-25 9AQ N-[5-{[(2,4-diflurophenyl)sulfonyl]amino}-6- (dimethylamino)-3,4′-bipyridin-2′-yl]acetamide I-26 8D N-{5-[(cyclopropylsulfonyl)(ethyl)amino]-6- methyl-3,4′-bipyridin-2′-yl}acetamide I-27 20B 2′-acetamido-6-amino-N,N-diethyl-3,4′-bipyridine- 5-carboxamide I-28 10H N-(5-{[(2-fluoro-5-methylphenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)acetamide I-29 18 N-{4-[1-(cyclopropylmethyl)-2,2-dioxido-1,3- dihydro[1,2,5]thiadiazole[3,4-b]pyridin-6- yl]pyridin-2-yl}acetamide I-30 9B N-(5-{[(2,4-dichlorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-31 9AR N-[5-{[(2,4-dichlorophenyl)sulfonyl]amino}-6- (methylamino)-3,4′-bipyridin-2′-yl}acetamide I-32 9G N-{5-[(dimethylsulfamoyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}acetamide I-33 8M N-{4-[1-(methylsulfonyl)-1H-pyrrolo[3,2- b]pyridin-6-yl]pyridin-2-yl}acetamide I-34 6B methyl[6-amino-5-(isopropylsulfonyl)-3,4′- bipyridin-2′-yl]carbamate I-35 17 N-{6-amino-5-[(cyclopropylmethyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-36 6A methyl[6-amino-5-(pyrrolidin-1-ylsulfonyl)-3,4′- bipyridin-2′-yl]carbamate I-37 5F N-{6-amino-5-[methyl(phenyl)sulfamoyl]-3,4′- bipyridin-2′-yl}acetamide I-38 30 methyl[4-(1H-pyrazolo[3,4-b]pyridin-5- yl)pyridin-2-yl]carbamate I-39 5AH N-[6-methoxy-5-(phenylsulfamoyl)-3,4′-bipyridin- 2′-yl]acetamide I-40 24 N-{4-[3-(dimethylsulfamoyl)-1H-pyrrolo[2,3- b]pyridin-5-yl]pyridin-2-yl}acetamide I-41 9 N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-42 28 methyl {4-[1-(cyclopropylmethyl)-1H-pyrrolo[3,2- b]pyridin-6-yl]pyridin-2-yl}carbamate I-43 SI N-[6-amino-5-(phenylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-44 9AG N-(5-{[(4-ethylphenyl)sulfonyl]amino}-6-methyl- 3,4′-bipyridin-2′-yl)acetamide I-45 9AN N-{6-methyl-5-[(pyridin-3-ylsulfonyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-46 8F N-{6-methyl-5-[methyl(phenylsulfonyl)amino]- 3,4′-bipyridin-2′-yl}acetamide I-47 5Y N-[5-(pyrrolidin-1-ylsulfonyl)-3,4′-bipyridin-2′- yl]acetamide I-48 20AA 2′-acetamido-N,N-dimethyl-3,4′-bipyridine-5- carboxamide I-49 5X N-{6-amino-5-[(cyclopropylmethyl)sulfamoyl]-4- methyl-3,4′-bipyridin-2′-yl}acetamide I-50 7K N-(6-amino-5-{[2- (trifluoromethyl)benzyl]sulfonyl}-3,4′-bipyridin- 2′-yl)acetamide I-51 7N N-[5-(methylsulfonyl)-3,4′-bipyridin-2′- yl]acetamide I-52 9H N-(5-{[(2,5-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-53 17A N-{5-amino-6-[(cyclopropylmethyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-54 32 N-{4-[3-(pyrrolidin-1-ylmethyl)-1H-pyrrolo[2,3- b]pyridin-5-yl]pyridin-2-yl}acetamide I-55 6C methyl [6-amino-5-(dimethylcarbamoyl)-3,4′- bipyridin-2′-yl]carbamate I-56 16B N-{6-chloro-5′-methyl-5-[(phenylsulfonyl)amino]- 3,4′-bipyridin-2′-yl}acetamide I-57 201 2′-acetamido-6-amino-N-methyl-3,4′-bipyridine-5- carboxamide I-58 9Y N-(5-{[(4-fluoro-2- methoxyphenyl)sulfonyl]amino}-6-methyl-3,4′- bipyridin-2′-yl)acetamide I-59 9J N-(5-{[(3,4-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-60 20Q N-{6-amino-5-[(3,3-difluoropyrrolidin-1- yl)carbonyl]-3,4′-bipyridin-2′-yl}acetamide I-61 5J N-(6-amino-5-sulfamoyl-3,4′-bipyridin-2′- yl)acetamide I-62 10A N-[6-methyl-5-({[2- (trifluoromethyl)phenyl]sulfonyl}amino)-3,4′- bipyridin-2′-yl]acetamide I-63 5AF N-{5-[(2,4-difluorophenyl)sulfamoyl]-6- (methylamino)-3,4′-bipyridin-2′-yl}acetamide I-64 12B N-(6-amino-5-{[(2,4- difluorophenyl)sulfonyl]amino}-3,4′-bipyridin-2′- yl)acetamide I-65 17B N-{5,6-bis[(cyclopropylmethyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-66 27 N-[4-(2-methyl-3H-imidazo[4,5-b]pyridin-6- yl)pyridin-2-yl]acetamide I-67 8H N-[4-(2,3-dihydro-1H-pyrrolo[2,3-b]pyridin-5- yl)pyridin-2-yl]acetamide I-68 18A N-{4-[3-(cyclopropylmethyl)-2,2-dioxido-1,3- dihydro[1,2,5]thiadiazole[3,4-b]pyridin-6- yl]pyridin-2-yl}acetamide I-69 7M N-[6-amino-5-(ethylsulfonyl)-3,4′-bipyridin-2′- yl]acetamide I-70 9W N-(5-{[(3-tert-butylphenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-71 200 N-[6-amino-5-(2,3-dihydro-1H-indol-1- ylcarbonyl)-3,4′-bipyridin-2′-yl]acetamide I-72 9AI N-{5-[(cyclohexylsulfonyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}acetamide I-73 50 N-[6-amino-5-(isobutylsulfamoyl)-3,4′-bipyridin- 2′-yl]acetamide I-74 9K N-(5-{[(2-methoxyphenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-75 20Z 2′-acetamido-N,N,6-trimethyl-3,4′-bipyridine-5- carboxamide I-76 5K N-{6-amino-5-enzyl(methyl)sulfamoyl]-3,4′- bipyridin-2′-yl}acetamide I-77 5AB N-[6-amino-5-(diisopropylsulfamoyl)-3,4′- bipyridin-2′-yl]acetamide I-78 9R N-{6-methyl-5-[(1-naphthylsulfonyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-79 20J N-{6-amino-5-[(4-methylpiperazin-1-yl)carbonyl]- 3,4′-bipyridin-2′-yl}acetamide I-80 9P N-(6-methyl-5-{[(4- methylphenyl)sulfonyl]amino}-3,4′-bipyridin-2′- yl)acetamide I-81 20C N-{6-amino-5-[(4-methylpiperidin-1-yl)carbonyl]- 3,4′-bipyridin-2′-yl}acetamide I-82 20N 2′-acetamido-6-amino-N-(3-fluorophenyl)-3,4′- bipyridine-5-carboxamide I-83 8C N-{5- [(cyclopropylmethyl)(cyclopropylsulfonyl)amino]- 6-methyl-3,4′-bipyridin-2′-yl}acetamide I-84 9A N-{6-methyl-5-[(phenylsulfonyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-85 32B N-(4-{3-[(dimethylamino)methyl]-1H-pyrrolo b]pyridin-5-yl}pyridin-2-yl)acetamide I-86 9AO N-(4-{4-[(2′-acetamido-6-methyl-3,4′-bipyridin-5- yl)sulfamoyl]-3-fluorophenyl}pyridin-2- yl)acetamide I-87 5V N-[6-amino-5-(pyrrolidin-1-ylsulfonyl)-3,4′- bipyridin-2′-yl]acetamide I-88 11B N-[5-(1,1-dioxidoisothiazolidin-2-yl)-6-methyl- 3,4′-bipyridin-2′-yl]acetamide I-89 5T N-[6-amino-5-(methylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-90 9AD N-[6-methyl-5-({[4- (trifluoromethyl)phenyl]sulfonyl}amino)-3,4′- bipyridin-2′-yl]acetamide I-91 20H 2′-acetamido-6-amino-N-(pyridin-3-yl)-3,4′- bipyridine-5-carboxamide I-92 10D N-(6-methyl-5-{[(1-methyl-1H-imidazol-2- yl)sulfonyl]amino}-3,4′-bipyridin-2′-yl)acetamide I-93 8L N-{4-[1-(cyclopropylmethyl)-1H-pyrrolo[3,2- b]pyridin-6-yl]pyridin-2-yl}acetamide I-94 9S N-(5-{[(4-chloro-2-fluorophenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)acetamide I-95 7 N-[6-amino-5-(methylsulfonyl)-3,4′-bipyridin-2′- yl]acetamide I-96 8E N-{6-methyl-5-[methyl(methylsulfonyl)amino]- 3,4′-bipyridin-2′-yl}acetamide I-97 5B N-{6-amino-5-[(3-chlorophenyl)sulfamoyl]-3,4′- bipyridin-2′-yl}acetamide I-98 5G N-[6-amino-5-(2-naphthylsulfamoyl)-3,4′- bipyridin-2′-yl]acetamide I-99 7B N-{6-amino-5-[(4-chlorobenzyl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-100 SAG N-[6-(methylamino)-5-(phenylsulfamoyl)-3,4′- bipyridin-2′-yl]acetamide I-101 SE N-[6-amino-5-(cyclohexylsulfamoyl)-3,4′- bipyridin-2′-yl]acetamide I-102 9AL N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-4- methyl-3,4′-bipyridin-2′-yl)acetamide I-103 24C N-(4-{3-[(4-methylpiperazin-1-yl)sulfonyl]-1H- pyrrolo[2,3-b]pyridin-5-yl}pyridin-2-yl)acetamide I-104 9AS N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methoxy-3,4′-bipyridin-2′-yl)acetamide I-105 23 N-{4-[2-(cyclopropylsulfonyl)-2H-pyrazolo[4,3- b]pyridin-6-yl]pyridin-2-yl}acetamide I-106 21A N-(2′-acetamido-3,4′-bipyridin-5-yl)-2- phenylacetamide I-107 5AI N-{5-[(2,4-difluorophenyl)sulfamoyl]-6-methoxy- 3,4′-bipyridin-2′-yl}acetamide I-108 5A N-{6-amino-5-[(cyclopropylmethyl)sulfamoyl]- 3,4′-bipyridin-2′-yl}acetamide I-109 9C N-(5-{[(2-chlorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-110 5S N-{6-amino-5- [(cyclopropylmethyl)(methyl)sulfamoyl]-3,4′- bipyridin-2′-yl}acetamide I-111 9F N-(5-{[(2,5-dichlorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-112 22A 2′-acetamido-N-(2,4-difluorophenyl)-6- (dimethylamino)-3,4′-bipyridine-5-carboxamide I-113 9AA N-[5-({[2-chloro-4- (trifluoromethoxy)phenyl]sulfonyl}amino)-6- methyl-3,4′-bipyridin-2′-yl]acetamide I-114 10C N-{5-[(cyclopropylsulfonyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}acetamide I-115 21B N-(2′-acetamido-6-methyl-3,4′-bipyridin-5-yl)-2,4- difluorobenzamide I-116 8J N-[4-(1H-pyrazolo[4,3-b]pyridin-6-yl)pyridin-2- yl]acetamide I-117 30A N-[4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2- yl]cyclopropanecarboxamide I-118 SAN N-{5-[(3,3-difluoropyrrolidin-1-yl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-119 5 N-[6-amino-5-(dimethylsulfamoyl)-3,4′-bipyridin- 2′-yl]acetamide I-120 5Z N-[5-(diethylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-121 20M 2′-acetamido-6-amino-N-(5-methylpyridazin-3-yl)- 3,4′-bipyridine-5-carboxamide I-122 7P 2′-acetamido-6-amino-3,4′-bipyridine-5-sulfonic acid I-123 9E N-(5-{[(3-methoxyphenyl)sulfonyl]amino{-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-124 5U N-[6-amino-5-(diethylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-125 20D N-[6-amino-5-(1,3-dihydro-2H-isoindoI-2- ylcarbonyl)-3,4′-bipyridin-2′-yl]acetamide I-126 7D N-{6-amino-5-[(2-phenylethyl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-127 20X 2′-acetamido-6-methoxy-N,N-dimethyl-3,4′- bipyridine-5-carboxamide I-128 10E N-(5-{[(2-chloro-4- methylphenyl)sulfonyl]amino{-6-methyl-3,4′- bipyridin-2′-yl)acetamide I-129 14A N-(4-{6-methyl-5-[methyl(methylsulfonyl)amino]- 1-oxidopyridin-3-yl{pyridin-2-yl)acetamide I-130 9AB N-(5-{[(2-fluoro-4-methylphenyl)sulfonyl]amino}- 5′,6-dimethyl-3,4′-bipyridin-2′-yl)acetamide I-131 9Q N-(5-{[(4-tert-butylphenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-132 13A N-[5-(1,1-dioxidoisothiazolidin-2-yl)-6- (methylamino)-3,4′-bipyridin-2′-yl]acetamide I-133 12 N-{6-amino-5-[methyl(methylsulfonyl)amino]- 3,4′-bipyridin-2′-yl}acetamide I-134 9AJ N-(5-{[(4-isopropylphenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-135 26 N-{4-[1-(cyclopropylmethyl)-1H-imidazo[4,5- b]pyridin-6-yl]pyridin-2-yl}acetamide I-136 20P 2′-acetamido-6-amino-N-(2-chlorophenyl)-3,4′- bipyridine-5-carboxamide I-137 5W N-[5-(dimethylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-138 7A N-{6-amino-5-[(2,4-difluorobenzyl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-139 7O N-(5-amino-3,4′-bipyridin-2′-yl)acetamide I-140 8I N-[4-(1H-pyrrolo[2,3-b]pyridin-5-yl)pyridin-2- yl]acetamide I-141 13B N-{5- [(cyclopropylmethyl)(methylsulfonyl)amino]-6- (methylamino)-3,4′-bipyridin-2′-yl}acetamide I-142 9AC N-(5-{[(2-methoxy-4- methylphenyl)sulfonyl]amino}-6-methyl-3,4′- bipyridin-2′-yl)acetamide I-143 9U N-[5-({[2-fluoro-5- (trifluoromethyl)phenyl]sulfonyl}amino)-6- methyl-3,4′-bipyridin-2′-yl]acetamide I-144 9M N-(5-{[(2-fluorophenyl)sulfonyl]amino}-6-methyl- 3,4′-bipyridin-2′-yl)acetamide I-145 7J N-{6-amino-5-[(2-ethoxyethyl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-146 16A methyl[5-(1,1-dioxidoisothiazolidin-2-yl)-6- methyl-3,4′-bipyridin-2′-yl]carbamate I-147 13 N-{6-(methylamino)-5- [methyl(methylsulfonyl)amino]-3,4′-bipyridin-2′- yl}acetamide I-148 SD N-{6-amino-5-[(2-phenylethyl)sulfamoyl]-3,4′- bipyridin-2′-yl}acetamide I-149 20 2′-acetamido-6-amino-N,N-dimethyl-3,4′- bipyridine-5-carboxamide I-150 9X N-(5-{[(2,6-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-151 24B N-{4-[1-methyl-3-(pyrrolidin-1-ylsulfonyl)-1H- pyrrolo[2,3-b]pyridin-5-yl]pyridin-2-yl}acetamide I-152 20S N-[6-amino-5-(morpholin-4-ylcarbonyl)-3,4′- bipyridin-2′-yl]acetamide I-153 9AX N-(6-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)acetamide I-154 9AE N-(5-{[(4-chlorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-155 9N N-(5-{[(3-fluorophenyl)sulfonyl]amino}-6-methyl- 3,4′-bipyridin-2′-yl)acetamide I-156 SN N-[6-amino-5-(piperidin-1-ylsulfonyl)-3,4′- bipyridin-2′-yl]acetamide I-157 20T N-(6-amino-5-{[(3R)-3-fluoropyrrolidin-1- yl]carbonyl}-3,4′-bipyridin-2′-yl)acetamide I-158 24A N-{4-[3-(pyrrolidin-1-ylsulfonyl)-1H-pyrrolo[2,3- b]pyridin-5-yl]pyridin-2-yl}acetamide I-159 9T N-(5-{[(2,5-difluoro-4- methoxyphenyl)sulfonyl]amino}-6-methyl-3,4′- bipyridin-2′-yl)acetamide I-160 20AB 2′-acetamido-N-(bicyclo[1.1.1]pent-1-yl)-6- (methylamino)-3,4′-bipyridine-5-carboxamide I-161 9AU N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-5′- fluoro-6-methyl-3,4′-bipyridin-2′-yl)acetamide I-162 20W 2′-acetamido-6-(dimethylamino)-N,N-dimethyl- 3,4′-bipyridine-5-carboxamide I-163 9Z N-(5-{[(2-fluoro-4- methoxyphenyl)sulfonyl]amino}-6-methyl-3,4′- bipyridin-2′-yl)acetamide I-164 91 N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- fluoro-3,4′-bipyridin-2′-yl)acetamide I-165 9AF N-(5-{[(4-methoxyphenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-166 SAA 6-amino-N,N-dimethyl-2′-(1,3-oxazol-2-ylamino)- 3,4′-bipyridine-5-sulfonamide I-167 9AM N-{6-methyl-5-[(methylsulfonyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-168 9L N-[6-methyl-5-({[3- (trifluoromethyl)phenyl]sulfonyl}amino)-3,4′- bipyridin-2′-yl]acetamide I-169 20L 2′-acetamido-6-amino-N-cyclopropyl-3,4′- bipyridine-5-carboxamide I-170 SAE N-{6-amino-5-[(2,4-difluorophenyl)sulfamoyl]- 3,4′-bipyridin-2′-yl}acetamide I-171 6 methyl[6-amino-5-(dimethylsulfamoyl)-3,4′- bipyridin-2′-yl]carbamate I-172 7E N-{6-amino-5-[(2-chlorobenzyl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-173 5AJ N-[5-(diisopropylsulfamoyl)-6-(methylamino)- 3,4′-bipyridin-2′-yl]acetamide I-174 22 2′-acetamido-N-(2,4-difluorophenyl)-6- (dimethylamino)-N-methyl-3,4′-bipyridine-5- carboxamide I-175 7G N-[6-amino-5-(isopropylsulfonyl)-3,4′-bipyridin- 2′-yl]acetamide I-176 29 N-{4-[3-(phenylsulfonyl)-1H-pyrrolo[2,3- b]pyridin-5-yl]pyridin-2-yl}acetamide I-177 9AW N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-5′,6- dimethyl-3,4′-bipyridin-2′-yl)acetamide I-178 90 N-(5-{[(2,5-dimethylphenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-179 20U 2′-acetamido-6-amino-N-(2,3-difluorophenyl)-3,4′- bipyridine-5-carboxamide I-180 16C methyl[5-(cyclopropylcarbonyl)-3,4′-bipyridin-2′- yl]carbamate I-181 12A N-[6-amino-5-(1,1-dioxidoisothiazolidin-2-yl)- 3,4′-bipyridin-2′-yl]acetamide I-182 10B N-(5-{[(2-fluoro-4-methylphenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)acetamide I-183 5M N-{6-amino-5-[(cyclohexylmethyl)sulfamoyl]-3,4′- bipyridin-2′-yl}acetamide I-184 5AC N-(5-formyl-3,4′-bipyridin-2′-yl)acetamide I-185 9AH N-(5-{[(4-fluorophenyl)sulfonyl]amino}-6-methyl- 3,4′-bipyridin-2′-yl)acetamide I-186 4 N-[6-amino-5-(dimethylsulfamoyl)-5′-fluoro-3,4′- bipyridin-2′-yl]acetamide I-187 20G 2′-acetamido-6-amino-N-(bicyclo[1.1.1]pent-1-yl)- 3,4′-bipyridine-5-carboxamide I-188 19 N-{5-[(1E)-3-(4-fluorophenyl)-3-oxoprop-1-en-1- yl]-3,4′-bipyridin-2′-yl}acetamide I-189 33 N-[4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2- yl]acetamide I-190 5AL N-[5-(bicyclo[1.1.1]pent-1-ylsulfamoyl)-3,4′- bipyridin-2′-yl]acetamide I-191 14 N-{4-[5-(methylsulfonyl)-1-oxidopyridin-3- yl]pyridin-2-yl}acetamide I-192 11 N-[5-(1,1-dioxidoisothiazolidin-2-yl)-3,4′- bipyridin-2′-yl]acetamide I-193 21C N,N′-(6-methyl-3,4′-bipyridine-2′,5- diyl)diacetamide I-194 5AD N-(5-acetyl-3,4′-bipyridin-2′-yl)acetamide I-195 16 methyl (5-{[(2,4-difluorophenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)carbamate I-196 10F N-[5-({[2-chloro-4- (trifluoromethyl)phenyl]sulfonyl}amino)-6- methyl-3,4′-bipyridin-2′-yl]acetamide I-197 7F N-{6-amino-5-[(2-fluorobenzyl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-198 19A N-{5-[(2E)-3-(4-fluorophenyl)prop-2-enoyl]-3,4′- bipyridin-2′-yl}acetamide I-199 8N N-{4-[1-(cyclopropylsulfonyl)-1H-pyrrolo[3,2- b]pyridin-6-yl]pyridin-2-yl}acetamide I-200 20A N-[6-amino-5-(azetidin-1-ylcarbonyl)-3,4′- bipyridin-2′-yl]acetamide I-201 9AT N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- ethyl-3,4′-bipyridin-2′-yl)acetamide I-202 8G N-{5- [(cyclopropylmethyl)(methylsulfonyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-203 10I N-{6-methyl-5-[(3-thienylsulfonyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-204 5H N-[6-amino-5-(pyridin-3-ylsulfamoyl)-3,4′- bipyridin-2′-yl]acetamide I-205 71 N-{6-amino-5-[(pyridin-3-ylmethyl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-206 10 N-(5-{[(2-chloro-4-fluorophenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)acetamide I-207 5P N-{6-amino-5-[(4-chlorophenyl)sulfamoyl]-3,4′- bipyridin-2′-yl}acetamide I-208 7L N-{6-amino-5-[(cyclopropylmethyl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-209 31 N-[5-methyl-4-(1H-pyrazolo[3,4-b]pyridin-5- yl)pyridin-2-yl]acetamide I-210 20R 2′-acetamido-6-amino-N-(tetrahydro-2H-pyran-4- yl)-3,4′-bipyridine-5-carboxamide I-211 9D N-(6-methyl-5-{[(2- methylphenyl)sulfonyl]amino}-3,4′-bipyridin-2′- yl)acetamide I-212 8 N-{5-[(cyclopropylsulfonyl)(methyl)amino]-6- methyl-3,4′-bipyridin-2′-yl}acetamide I-213 20Y 2′-acetamido-6-chloro-N,N-dimethyl-3,4′- bipyridine-5-carboxamide I-214 9AY N-{6-methyl-5-[(piperidin-1-ylsulfonyl)amino]- 3,4′-bipyridin-2′-yl}acetamide I-215 43 6-chloro-N-cyclobutyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridine-5-sulfonamide I-216 20AF 6-amino-N-carbamimidoyl-2′-(pyrimidin-4- ylamino)-3,4′-bipyridine-5-carboxamide I-217 35F N,N-dimethyl-Y-[6-methyl-2′-(pyrimidin-4- ylamino)-3,4′-bipyridin-5-yl]sulfuric diamide I-218 35D N-{6-chloro-2′-[(2,6-dimethylpyrimidin-4- yl)amino]-4-methyl-3,4′-bipyridin-5-yl}-2,4- difluorobenzenesulfonamide I-219 35AE N-[4-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methylpyridin-3-yl)-1-oxidopyridin-2- yl]acetamide I-220 9BI N-{5-[(dimethylsulfamoyl)amino]-6-methoxy-3,4′- bipyridin-2′-yl}acetamide I-221 39A (3,3-difluoroazetidin-1-yl){6-methyl-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5- yl}methanone I-222 22E N-(bicyclo[1.1.1]pent-1-yl)-N-methyl-6- (methylamino)-2′-(pyrimidin-4-ylamino)-3,4′- bipyridine-5-carboxamide I-223 40 azetidin-1-yl{6-methyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridin-5-yl}methanethione I-224 43B N-cyclobutyl-6-methoxy-2′-[(2-methylpyrimidin- 4-yl)amino]-3,4′-bipyridine-5-sulfonamide I-225 35E N-{6-chloro-2′-[(2-methoxypyrimidin-4- yl)amino]-4-methyl-3,4′-bipyridin-5-yl}-2,4- difluorobenzene sulfonamide I-226 34H 6-chloro-4-methyl-N~2~′-(2-methylpyrimidin-4- yl)-3,4′-bipyridine-2′,5-diamine I-227 36C N-(6-chloro-5-{[(2,5- difluorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)acetamide I-228 35Q N-{2′-[(5-cyanopyridin-2-yl)amino]-6-methyl-3,4′- bipyridin-5-yl}-2,4-difluorobenzene sulfonamide I-229 35M N-{2′-[(5-cyano-6-methylpyridin-2-yl)amino]-6- methyl-3,4′-bipyridin-5-yl}-N,N-dimethylsulfuric diamide I-230 37 6-amino-N-(bicyclo[1.1.1]pent-1-yl)-2′-[(2- methoxypyrimidin-4-yl)amino]-N-methyl-3,4′- bipyridine-5-carboxamide I-231 35AB 3,4′-bipyridine-2′,5-diamine I-232 20AE azetidin-1-yl{6-chloro-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridin-5-yl}methanone I-233 35V N-[2'-(1,3-benzoxazol-2-ylamino)-6-methyl-3,4′- bipyridin-5-yl]-2,4-difluorobenzene sulfonamide I-234 37B N-(bicyclo[1.1.1]pent-1-yl)-N-methyl-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridine-5- carboxamide I-235 35Y 2,4-difluoro-N-{6-methyl-2′-[(7-methyl-1,8- naphthyridin-2-yl)amino]-3,4′-bipyridin-5- yl}benzenesulfonamide I-236 361 N-{6-chloro-5-[(dimethylsulfamoyl)amino]-4- methyl-3,4′-bipyridin-2′-yl}acetamide I-237 35B 2,4-difluoro-N-(6-methyl-2′-{[2- (trifluoromethyl)pyrimidin-4-yl]amino}-3,4′- bipyridin-5-yl)benzenesulfonamide I-238 35L N-{6-chloro-2′-[(5-cyano-6-methylpyridin-2- yl)amino]-4-methyl-3,4′-bipyridin-5-yl}-2,4- difluorobenzenesulfonamide I-239 35H 2,4-difluoro-N-[6-methyl-2′-(pyrimidin-4- ylamino)-3,4′-bipyridin-5-ylenzene sulfonamide I-240 36E N-(6-chloro-5-{[(2-chlorophenyl)sulfonyl]amino}- 4-methyl-3,4′-bipyridin-2′-yl)acetamide I-241 35AI methyl {5-[(dimethylsulfamoyl)amino]-6-methyl- 3,4′-bipyridin-2′-yl}carbamate I-242 43C N-(bicyclo[1.1.1]pent-1-yl)-6-chloro-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridine-5- sulfonamide I-243 36F N-(6-chloro-5-{[(2,4- dichlorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)acetamide I-244 9AZ N-{5-[(dimethylsulfamoyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}-2,2- difluorocyclopropanecarboxamide I-245 37A N-(bicyclo[1.1.1]pent-1-yl)-2′-[(2- methoxypyrimidin-4-yl)amino]-N-methyl-3,4′- bipyridine-5-carboxamide I-246 38A azetidin-1-yl{2′-[(2-cyclopropylpyrimidin-4- yl)amino]-6-methyl-3,4′-bipyridin-5-yl}methanone I-247 34D N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-4,6- dimethyl-3,4′-bipyridin-2′-yl)acetamide I-248 34E N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methoxy-4-methyl-3,4′-bipyridin-2′-yl)acetamide I-249 41A 2,4-difluoro-N-{6-methyl-2′-[(2-methylpyrimidin- 4-yl)amino]-3,4′-bipyridin-5-yl}benzamide I-250 36H N-(6-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-4,5′-dimethyl- 3,4′-bipyridin-2′-yl)acetamide I-251 36B N-(6-chloro-5-{[(2-fluorophenyl)sulfonyl]amino}- 4-methyl-3,4′-bipyridin-2′-yl)acetamide I-252 38D N-(2,4-difluorophenyl)-6-methoxy-N-methyl-2′- [(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridine- 5-carboxamide I-253 39 6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′- bipyridine-5-carboxylic acid I-254 36A N-(6-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)-2,2- difluorocyclopropanecarboxamide I-255 35AG methyl (6-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)carbamate I-256 341 6-chloro-N~5~,4-dimethyl-N~2~′-(2- methylpyrimidin-4-yl)-3,4′-bipyridine-2′,5-diamine I-257 9BF N-{5-[(azetidin-1-ylsulfonyl)amino]-6-methyl- 3,4′-bipyridin-2′-yl}acetamide I-258 9BH N-[4-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methyl-1-oxidopyridin-3-yl)pyridin-2- yl]acetamide I-259 34A N-{6-chloro-4-ethyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridin-5-yl}-2,4- difluorobenzene sulfonamide I-260 34F N-{5-[(dimethylsulfamoyl)amino]-4,6-dimethyl- 3,4′-bipyridin-2′-yl}acetamide I-262 20AJ {6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]- 3,4′-bipyridin-5-yl}(piperidin-1-yl)methanone I-263 35AC N,N-dimethyl-N-[6-methyl-2′-(4-methyl-1H- imidazo[4,5-c]pyridin-1-yl)-3,4′-bipyridin-5- yl]sulfuric diamide I-264 35A N-{6-chloro-4-methyl-2′-[(2-phenylpyrimidin-4- yl)amino]-3,4′-bipyridin-5-yl}-2,4- difluorobenzenesulfonamide I-265 35U 2,4-difluoro-N-[6-methyl-2′-(pyrimidin-2- ylamino)-3,4′-bipyridin-5-yl]benzenesulfonamide I-266 38C N,N,6-trimethyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridine-5-carboxamide I-267a 9BC N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)-2,2- difluorocyclopropanecarboxamide (Chiral Sep Peak1) I-267b 9BB N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)-2,2- difluorocyclopropanecarboxamide (Chiral Sep Peak2) I-268 34G N-{5-[(dimethylsulfamoyl)amino]-6-methoxy-4- methyl-3,4′-bipyridin-2′-yl}acetamide I-269 9BE N-(6-methyl-5-{[(4-methylpiperazin-1- yl)sulfonyl]amino}-3,4′-bipyridin-2′-yl)acetamide I-271 35Z N-[2′-(1,3-benzothiazol-2-ylamino)-6-methyl-3,4′- bipyridin-5-yl]-2,4-difluorobenzenesulfonamide I-272 35Kyl) N-{6-chloro-4-methyl-2′-[(2-methylpyridin-4- amino]-3,4′-bipyridin-5-yl}-2,4- difluorobenzenesulfonamide I-273 9BD N-(5-{[ethyl(methyl)sulfamoyl]amino}-6-methyl- 3,4′-bipyridin-2′-yl)acetamide I-274 9BG N-{6-methyl-5-[(pyrrolidin-1-ylsulfonyl)amino]- 3,4′-bipyridin-2′-yl}acetamide I-275 37C N-(bicyclo[1.1.1]pent-1-yl)-N,6-dimethyl-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridine-5- carboxamide I-276 35T 2,4-difluoro-N-{6-methyl-2′-[(6-methylpyridin-2- yl)amino]-3,4′-bipyridin-5-yl}benzenesulfonamide I-277 37D 6-amino-N-(bicyclo[1.1.1]pent-1-yl)-N-methyl-2′- [(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridine- 5-carboxamide I-278 34C N-(6-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-4-ethyl-3,4′- bipyridin-2′-yl)cyclopropanecarboxamide I-279 43A N-cyclobutyl-6-hydroxy-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridine-5-sulfonamide I-280 20AH 6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′- bipyridine-5-carboxamide I-281 35AA N′-(2′-amino-6-methyl-3,4′-bipyridin-5-yl)-N,N- dimethylsulfuric diamide I-282 34B N-[6-chloro-4-methyl-2′-(pyrimidin-4-ylamino)- 3,4′-bipyridin-5-yl]-2,4- difluorobenzenesulfonamide I-283 22B 2′-acetamido-N-(bicyclo[1.1.1]pent-1-yl)-6- (dimethylamino)-3,4′-bipyridine-5-carboxamide I-284 22D N-(bicyclo[1.1.1]pent-1-yl)-6-(dimethylamino)-N- methyl-2′-(pyrimidin-4-ylamino)-3,4′-bipyridine-5- carboxamide I-285 39 N-(cyclopropylmethyl)-6-methyl-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridine-5- carboxamide I-286 351 N,N-dimethyl-N-{6-methyl-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5- yl}sulfuric diamide I-287 35AD N-(2′-amino-6-chloro-4-methyl-3,4′-bipyridin-5- yl)-2,4-difluorobenzenesulfonamide I-288 42 6-methyl-5-(6-methyl-1,1-dioxido-1,2,6- thiadiazinan-2-yl)-N-(2-methylpyrimidin-4-yl)- 3,4′-bipyridin-2′-amine I-289 35N N-{2′-[(5-cyano-6-methylpyridin-2-yl)amino]-6- methyl-3,4′-bipyridin-5-yl}-2,4- difluorobenzene sulfonamide I-290 36D N-(6-chloro-5-{[(2-chloro-4- fluorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)acetamide I-291 35J 2,4-difluoro-N-{6-methyl-2′-[(2-methylpyrimidin- 4-yl)amino]-3,4′-bipyridin-5- yl}benzenesulfonamide I-292 38B azetidin-1-yl(6-methyl-2′-{[2- (trifluoromethyl)pyrimidin-4-yl]amino}-3,4′- bipyridin-5-yl)methanone I-293 35P N-{6-chloro-4-methyl-2′-[(4-methylpyrimidin-2- yl)amino]-3,4′-bipyridin-5-yl}-2,4- difluorobenzene sulfonamide I-294 35 N-{6-chloro-5′-fluoro-4-methyl-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}- 2,4-difluorobenzenesulfonamide I-295 41 N-{6-chloro-4-methyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridin-5-yl}-2,4- difluorobenzamide I-296 35C N-{6-chloro-2′-[(2-cyclopropylpyrimidin-4- yl)amino]-4-methyl-3,4′-bipyridin-5-yl}-2,4- difluorobenzene sulfonamide I-297 35W 2,4-difluoro-N-[6-methyl-2′-(pyridin-2-ylamino)- 3,4′-bipyridin-5-yl]benzenesulfonamide I-298 20AG 6-amino-N-(bicyclo[1.1.1]pent-1-yl)-2′-(pyrimidin- 4-ylamino)-3,4′-bipyridine-5-carboxamide I-299 34 N-{6-chloro-4-methyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridin-5-yl}-2,4- difluorobenzene sulfonamide I-300 350 N-{6-chloro-2′-[(5-cyanopyrimidin-2-yl)amino]-4- methyl-3,4′-bipyridin-5-yl}-2,4- difluorobenzene sulfonamide I-301 35R 2,4-difluoro-N-{6-methyl-2′-[(1-methyl-1H- pyrazol-3-yl)amino]-3,4′-bipyridin-5- yl}benzenesulfonamide I-302 20AI N,N-diethyl-6-methyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridine-5-carboxamide I-303 20AC 6-amino-N-(bicyclo[1.1.1]pent-1-yl)-N-methyl-2′- (pyrimidin-4-ylamino)-3,4′-bipyridine-5- carboxamide I-304 38 azetidin-1-yl{6-methyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridin-5-yl}methanone I-305 35AF N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′- yl)cyclobutanecarboxamide I-306 22C N-(bicyclo[1.1.1]pent-1-yl)-6-(dimethylamino)-N- methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′- bipyridine-5-carboxamide I-307 35S 2,4-difluoro-N-{6-methyl-2′-[(6-methylpyridazin- 3-yl)amino]-3,4′-bipyridin-5- yl}benzenesulfonamide I-308 36 N-(6-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)cyclopropanecarboxamide I-309 35G N-[6-chloro-4-methyl-2′-(pyrimidin-4-ylamino)- 3,4′-bipyridin-5-yl]benzenesulfonamide I-310 35X 2,4-difluoro-N-[6-methyl-2′-(pyrazin-2-ylamino)- 3,4′-bipyridin-5-yl]benzenesulfonamide I-311 9BA N-{5-[(dimethylsulfamoyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}cyclopropanecarboxamide I-312 36G N-{6-chloro-4-methyl-5-[(phenylsulfonyl)amino]- 3,4′-bipyridin-2′-yl}acetamide I-313 35AH N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)pyrrolidine-1- carboxamide I-314 34J 6-chloro-N5,N5,4-trimethyl-N2′-(2- methylpyrimidin-4-yl)-3,4′-bipyridine-2′,5-diamine I-315 20AD {6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]- 3,4′-bipyridin-5-yl}(pyrrolidin-1-yl)methanone I-318 SAW N-[5-(adamantan-2-ylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-319 9DB N-(5-{[(2,4-difluorophenyl)sulfonyl](2- hydroxyethyl)amino}-6-methyl-3,4′-bipyridin-2′- yl)acetamide I-320 47A N-[5-(1,1-dioxido-1,2-thiazinan-2-yl)-3,4′- bipyridin-2′-yl]acetamide I-321 SAR N-[5-(benzylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-322 9CS N-(5-{[(2-chloro-3-fluorophenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)acetamide I-323 11J N-[6-amino-5-(6-methyl-1,1-dioxido-1,2,6- thiadiazinan-2-yl)-3,4′-bipyridin-2′-yl]acetamide I-324 35AK (3-methyloxetan-3-yl)methyl (5-{[(2,4- difluorophenyl)sulfonyl]amino}-6-methyl-3,4′- bipyridin-2′-yl)carbamate I-325 57A N-{6-methyl-5-[4-(methylamino)-1,1- dioxidoisothiazolidin-2-yl]-3,4′-bipyridin-2′- yl}acetamide I-326 35AM (1-methyl-1H-pyrazol-3-yl)methyl (5-{[(2,4- difluorophenyl)sulfonyl]amino}-6-methyl-3,4′- bipyridin-2′-yl)carbamate I-329 43K N-(6-methoxy-5-{[3- (trifluoromethyl)phenyl]sulfamoyl}-3,4′-bipyridin- 2′-yl)acetamide I-330 430 N-(6-chloro-5-{[(1S)-2-hydroxy-1- phenylethyl]sulfamoyl}-3,4′-bipyridin-2′- yl)acetamide I-331 52A N-(2′-acetamido-6-methoxy-3,4′-bipyridin-5-yl)- 2,4-difluoro-N-methylbenzamide I-332 35AQ methyl[5-(morpholin-4-ylsulfonyl)-3,4′-bipyridin- 2′-yl]carbamate I-333 9CB N-(6-chloro-5-(2-chloro-4- (trifluoromethyl)phenylsulfonamido)-4-methyl- [3,4′-bipyridin]-2′-yl)acetamide I-334 43U (S)-N-[4-(1,1-dioxido-3-phenyl-3,4-dihydro-2H- pyrido[2,3-b][1,4,5]oxathiazepin-8-yl)pyridin-2- yl]acetamide I-335 10M N-(6-chloro-5-{[(4-cyclopropyl-2- fluorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)acetamide I-336 34AC 5-[1-(2-chlorophenoxy)ethyl]-N-(2- methylpyrimidin-4-yl)-3,4′-bipyridin-2′-amine I-337 49 N-[6-amino-5-(oxopyrrolidin-1-yl)-3,4′- bipyridin-2′-yl]acetamide I-338 SAT N-[5-(cyclopropylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-339 9CU N-(5-{[(2-fluoro-3-methylphenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)acetamide I-340 45 N-[4-(8-{[(2,4- difluorophenyl)sulfonyl]amino}[1,2,4]triazolo[1,5- a]pyridin-6-yl)pyridin-2-yl]acetamide I-341 9BS N-{5-[(azepan-1-ylsulfonyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}acetamide I-342 9CT N-(5-{[(2,3-dichlorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-343 11H N[6-methyl-5-(6-methyl-1,1-dioxido-1,2,6- thiadiazinan-2-yl)-3,4′-bipyridin-2′-yl]acetamide I-344 43J N-{5-[(2,4-dichlorophenyl)sulfamoyl]-6-methoxy- 3,4′-bipyridin-2′-yl}acetamide I-346 20AQ N-(2,4-difluorophenyl)-N,6-dimethyl-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridine-5- carboxamide I-347 21E N-(2′-acetamido-6-methoxy-3,4′-bipyridin-5-yl)- 2,4-difluorobenzamide I-348 9BN N-{5-[(dimethylsulfamoyl)amino]-3,4′-bipyridin- 2′-yl}acetamide I-349 34AE N-(2-methylpyrimidin-4-yl)-5-[1-(pyridin-2- ylmethoxy)ethyl]-3,4′-bipyridin-2′-amine I-350 9CQ N-{5-[(dibutylsulfamoyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}acetamide I-352 11E N-[5-(1,1-dioxido-1,2,5-thiadiazolidin-2-yl)-6- methyl-3,4′-bipyridin-2′-yl]acetamide I-353 43M N-(5-(N-(2,4-difluorophenyl)sulfamoyl)-6-methyl- [3,4′-bipyridin]-2′-yl)acetamide I-354 9CA N-(6-chloro-5-{[(2,6- dichlorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)acetamide I-355 34S 6-chloro-N~2~′-(2-cyclopropylpyrimidin-4-yl)-4- methyl-3,4′-bipyridine-2′,5-diamine I-356 9CW N-(5-{[(4-cyano-2-fluorophenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)acetamide I-357 53B N-{5-[4-(benzylamino)-1,1-dioxidoisothiazolidin- 2-yl]-6-methyl-3,4′-bipyridin-2′-yl}acetamide I-358 431 N-{5-[(2,5-difluorophenyl)sulfamoyl]-6-methoxy- 3,4′-bipyridin-2′-yl}acetamide I-359 9BU 2′-acetamido-6-methyl-3,4′-bipyridin-5-yl dimethylsulfamate I-361 50 azetidin-1-yl{6-chloro-2′-[(2- cyclopropylpyrimidin-4-yl)amino]-4-methyl-3,4′- bipyridin-5-yl}methanone I-362 9BR N-(6-chloro-5-{[(2-chloro-4- cyanophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)acetamide I-363 34V 5-(benzyloxy)-6-methyl-N-(2-methylpyrimidin-4- yl)-3,4′-bipyridin-2′-amine I-364 35A0 ethyl {5-[(dimethylsulfamoyl)amino]-6-methyl- 3,4′-bipyridin-2′-yl}carbamate I-365 5AU N-{5-[methyl(phenyl)sulfamoyl]-3,4′-bipyridin-2′- yl}acetamide I-366 43G N-[5-(bicyclo[1.1.1]pent-1-ylsulfamoyl)-6-chloro- 3,4′-bipyridin-2′-yl]acetamide I-367 53B 1-ethyl-3-{6-methyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridin-5-yl}urea I-368 53 N-{2′-[(2-cyclopropylpyrimidin-4-34)amino]-6- methyl-3,4′-bipyridin-5-yl}-3,3-difluoroazetidine- l-carboxamide I-369 50 6-chloro-2′-[(2-cyclopropylpyrimidin-4-y0amino]- 4-methyl-3,4′-bipyridine-5-carboxylic acid I-370 43N N-[5-(diethylsulfamoyl)-6-methyl-3,4′-bipyridin- 2′-yl]acetamide I-371 21G N-(6-{2-[(2-cyclopropylpyrimidin-4- yl)amino]pyridin-4-yl}pyrazolo[1,5-a]pyridin-4- yl)acetamide I-372 9BP N-{6-chloro-5-[(dimethylsulfamoyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-373 10J N-{5-[(butylsulfonyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}acetamide I-374 9CD N-(5-{[(4,4-difluoropiperidin-1- yl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′- yl)acetamide I-375 35AU 2,4-difluoro-N-{2′-[(4-methoxy-6-methyl-1,3,5- triazin-2-yl)amino]-6-methyl-3,4′-bipyridin-5- yl}benzenesulfonamide I-376 9CZ N-{4-[2-(bicyclo[1.1.1]pent-1-yl)-1,1-dioxido-3,4- dihydro-2H-pyrido[2,3-b][1,4,5]oxathiazepin-8- yl]pyridin-2-yl}acetamide I-377 9CR N-(5-{[(2,3-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-378 54a 6-benzyl-3-{2-[(2-methylpyrimidin-4- yl)amino]pyridin-4-yl}-7,8-dihydro-1,6- naphthyridin-5(6H)-one I-379 34Z 5-[2-(dimethylamino)ethoxy]-6-methyl-N-(2- methylpyrimidin-4-yl)-3,4′-bipyridin-2′-amine I-380 9BK N-[6-cyano-5-(2-methylpiperidin-1-yl)-3,4′- bipyridin-2′-yl]acetamide I-381 34L N′-{6-chloro-4-methyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridin-5-yl}-N,N- dimethylsulfuric diamide I-382 35AV N-{2′-[(4-cyclopropyl-6-methyl-1,3,5-triazin-2- yl)amino]-6-methyl-3,4′-bipyridin-5-yl}-2,4- difluorobenzene sulfonamide I-383 35AR ethyl (6-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)carbamate I-384 9DA N-(5-{[(2,4-difluorophenyl)sulfonyl](2- hydroxyethyl)amino}-3,4′-bipyridin-2′- yl)acetamide I-386 11G N-[6-methyl-5-(5-methyl-1,1-dioxido-1,2,5- thiadiazolidin-2-yl)-3,4′-bipyridin-2′-yl]acetamide I-387 11F N-[5-(1,1-dioxido-1,2,6-thiadiazinan-2-yl)-6- methyl-3,4′-bipyridin-2′-yl]acetamide I-388 20AL N-(bicyclo[1.1.1]pent-1-yl)-2′- [(cyclopropylcarbonyl)amino]-N,6-dimethyl-3,4′- bipyridine-5-carboxamide I-389 35AN ethyl (5-{[(2,4-difluorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)carbamate I-390 34U 6-methyl-5-[(5-methylpyridin-2-yl)oxy]-N-(2- methylpyrimidin-4-yl)-3,4′-bipyridin-2′-amine I-391 5AZ N-{5-[(3,3-difluoroazetidin-1-yl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-392 51 N-[5-(1,3-benzoxazol-2-ylamino)-6-methyl-3,4′- bipyridin-2′-yl]acetamide I-394 9BM N-(4-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-3,4′-bipyridin-2′- yl)acetamide I-395 44 N-(6-methyl-5-sulfamoyl-3,4′-bipyridin-2′- yl)acetamide I-396 5AV N-[5-(cyclobutylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-397 52 N-(2′-acetamido-3,4′-bipyridin-5-yl)-2,4-difluoro- N-methylbenzamide I-398 52B N-(2′-acetamido-6-methyl-3,4′-bipyridin-5-yl)-2,4- difluoro-N-methylbenzamide I-399 9BY N-(6-chloro-5-{[(4-chloro-2- fluorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)acetamide I-401 9CC N-(6-chloro-5-{[(2,5- dichlorophenyl)sulfonyl]amino}-4-methyl-3,4′- bipyridin-2′-yl)acetamide I-402 50B 6-chloro-4-methyl-2′-[(2-methylpyrimidin-4- yl)amino]-3,4′-bipyridine-5-carboxylic acid I-403 43P N-(6-chloro-5-{[(1R)-2-hydroxy-1- phenylethyl]sulfamoyl}-3,4′-bipyridin-2′- yl)acetamide I-404 9CK N-[4-(4-{[(2,4- difluorophenyl)sulfonyl]amino}pyrazolo[1,5- a]pyridin-6-yl)pyridin-2-yl]acetamide I-405 9DC N-[5-(7-fluoro-1,1-dioxido-3,4-dihydro-2H-5,1,2- benzoxathiazepin-2-yl)-3,4′-bipyridin-2′- yl]acetamide I-406 54b 3-{2-[(2-methylpyrimidin-4-yl)amino]pyridin-4- yl}-7,8-dihydro-1,6-naphthyridin-5(6H)-one I-407 53E 3,3-difluoro-N-(6-{2-[(2-methylpyrimidin-4- yl)amino]pyridin-4-yl}pyrazolo[1,5-a]pyridin-4- yl)azetidine-1-carboxamide I-408 20AS (3,3-difluoroazetidin-1-yl){2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5- yl}methanone I-409 20AO 2′-acetamido-6-amino-N-carbamimidoyl-3,4′- bipyridine-5-carboxamide I-410 43D N-[5-(tert-butylsulfamoyl)-6-chloro-4-methyl-3,4′- bipyridin-2′-yl]acetamide I-411 9BJ N-(6-cyano-5-{[(2,4- difluorophenyl)sulfonyl]amino}-3,4′-bipyridin-2′- yl)acetamide I-412 10K N-(5-{[(2,2-difluoroethyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-413 20AU {2′-[(2-cyclopropylpyrimidin-4-yflamino]-3,4′- bipyridin-5-yl}(3,3-difluoroazetidin-1- yl)methanone I-414 35AP N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6,6′- dimethyl-3,4′-bipyridin-2′-yl)acetamide I-415 20AT {6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]- 3,4′-bipyridin-5-yl}(2-oxa-6-azaspiro[3.3]hept-6- yl)methanone I-416 9CY N-[5-(1,1-dioxidoisothiazol-2(3H)-yl)-6-methyl- 3,4′-bipyridin-2′-yl]acetamide I-417 35AX methyl (5-{[(4-chloro-2- fluorophenyl)sulfonyl]amino}-6-methyl-3,4′- bipyridin-2′-yl)carbamate I-418 44 N-[5-(bicyclo[1.1.1]pent-1-ylsulfamoyl)-6-methyl- 3,4′-bipyridin-2′-yl]acetamide I-419 21D N-(2′-acetamido-3,4′-bipyridin-5-yl)-2,4- difluorobenzamide I-420 43V (R)-N-(4-(1,1-dioxido-3-phenyl-3,4-dihydro-2H- pyrido[2,3-b][1,4,5]oxathiazepin-8-yl)pyridin-2- yl)acetamide I-421 34P N,N-dimethyl-N′-(6-{2-[(2-methylpyrimidin-4- yl)amino]pyridin-4-yl}pyrazolo[1,5-a]pyridin-4- yl)sulfuric diamide I-422 34AD 5-[1-(2-fluorophenoxy)ethyl]-N-(2- methylpyrimidin-4-yl)-3,4′-bipyridin-2′-amine I-423 20AM 2′-acetamido-N-(2,4-difluorophenyl)-6-methoxy- N-methyl-3,4′-bipyridine-5-carboxamide I-424 34Y 2-({6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]- 3,4′-bipyridin-5-yl}oxy)ethanol I-425 11C N-[6-chloro-5-(1,1-dioxidoisothiazolidin-2-yl)-4- methyl-3,4′-bipyridin-2′-yl]acetamide I-426 43F N-[5-(cyclobutylsulfamoyl)-6-methoxy-3,4′- bipyridin-2′-yl]acetamide I-427 34R N′-(6-{2-[(2-cyclopropylpyrimidin-4- yl)amino]pyridin-4-yl}pyrazolo[1,5-a]pyridin-4 yl)-N,N-dimethylsulfuric diamide I-428 9BX 6-(2-acetamidopyridin-4-yl)pyrazolo[1,5- a]pyridin-4-yl dimethylsulfamate I-429 9BQ N-(6-chloro-5-{[(4-cyanophenyl)sulfonyl]amino}- 4-methyl-3,4′-bipyridin-2′-yl)acetamide I-430 9CV N-(6-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-4,5′-dimethyl- 3,4′-bipyridin-2′-yl)cyclopropanecarboxamide I-431 20AN 2′-acetamido-N-(2,4-difluorophenyl)-6-methyl- 3,4′-bipyridine-5-carboxamide I-432 43H N-{5-[(2,5-dichlorophenyl)sulfamoyl]-6-methoxy- 3,4′-bipyridin-2′-yl}acetamide I-433 9CG N-(5-{[(4-chloro-2-fluorophenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′- yl)cyclopropanecarboxamide I-434 20AP N-[5-azetidin-1-ylcarbonyl)-6-chloro-5′-methyl- 3,4′-bipyridin-2′-yl]acetamide I-435 34N N′-{6-chloro-2′-[(2-cyclopropylpyrimidin-4- yl)amino]-4-methyl-3,4′-bipyridin-5-yl}-N,N- dimethylsulfuric diamide I-436 43R N-[5-(tert-butylsulfamoyl)-4-methyl-6- (methylamino)-3,4′-bipyridin-2′-yl]acetamide I-437 9CE N-{6-chloro-4-methyl-5-[(quinolin-5- ylsulfonyl)amino]-3,4′-bipyridin-2′-yl}acetamide I-438 5BA N-[6-chloro-5-(cyclobutylsulfamoyl)-3,4′- bipyridin-2′-yl]acetamide I-439 53C 1-{6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]- 3,4′-bipyridin-5-yl}-3-phenylurea I-440 34AF 5-[(4-fluoro-2,3-dihydro-1H-inden-1-yl)oxy]-N-(2- methylpyrimidin-4-yl)-3,4′-bipyridin-2′-amine I-441 9CF N-(5-{[(4-chloro-2-fluorophenyl)sulfonyl]amino}- 6-methyl-3,4′-bipyridin-2′-yl)-2,2- difluorocyclopropanecarboxamide I-442 43L N-[5-(tert-butylsulfamoyl)-6-methoxy-4-methyl- 3,4′-bipyridin-2′-yl]acetamide I-443 5AQ N-[5-(tert-butylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-444 10L N-(5-{[(4-bromo-2-fluorophenyl) sulfonyl]amino}- 6-chloro-4-methyl-3,4′-bipyridin-2′-yl)acetamide I-445 9CN N-{5-[(2-azabicyclo[2.2.1]hept-2- ylsulfonyl)amino]-6-methyl-3,4′-bipyridin-2′- yl}acetamide I-446 34X 5-isopropoxy-6-methyl-N-(2-methylpyrimidin-4- yl)-3,4′-bipyridin-2′-amine I-447 9BT N-{6-methyl-5-[(morpholin-4-ylsulfonyl)amino]- 3,4′-bipyridin-2′-yl}acetamide I-448 11L N-[6-chloro-5-(1,1-dioxido-1,2,6-thiadiazinan-2- yl)-3,4′-bipyridin-2′-yl]acetamide I-449 22F 2′-acetamido-N-(bicyclo[1.1.1]pent-1-yl)-N- methyl-6-(methylamino)-3,4′-bipyridine-5- carboxamide I-450 21F N-(6-{2-[(2-methylpyrimidin-4-34)amino]pyridin- 4-yl}pyrazolo[1,5-a]pyridin-4-yl)acetamide I-452 47 N-[5-(6-methyl-1,1-dioxido-1,2,6-thiadiazinan-2- yl)-3,4′-bipyridin-2′-yl]acetamide I-454 34AB N-(2-chloro-4-methyl-5-{2-[(2-methylpyrimidin-4- yl)amino]pyridin-4-yl}-1-oxidopyridin-3-yl)-2,4- difluorobenzenesulfonamide I-455 9BL N-{6-methyl-5-[(methylsulfamoyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-456 35AW ethyl (5-{[(4-chloro-2- fluorophenyl)sulfonyl]amino}-6-methyl-3,4′- bipyridin-2′-yl)carbamate I-457 50A azetidin-1-yl{6-chloro-4-methyl-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5- yl}methanone I-458 8O N-{5-[(dimethylsulfamoyl)(methyl)amino]-3,4′- bipyridin-2′-yl}acetamide I-459 5AS N-[5-(phenylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-460 48 N-[6-methyl-5-(2-oxotetrahydropyrimidin-1(2H)- yl)-3,4′-bipyridin-2′-yl]acetamide I-462 43W N-[5-(tert-butylsulfamoyl)-4-methyl-3,4′- bipyridin-2′-yl]acetamide I-463 9BO N-(5-{[(2,6-dichlorophenyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-464 5AO N-{5-[(2,4-difluorophenyl)sulfamoyl]-3,4′- bipyridin-2′-yl}acetamide I-465 9CH N-(5-{[(2,5-dichloro-3-thienyl)sulfonyl]amino}-6- methyl-3,4′-bipyridin-2′-yl)acetamide I-466 50C {6-chloro-2′-[(2-cyclopropylpyrimidin-4- yl)amino]-4-methyl-3,4′-bipyridin-5-yl}(3,3- dimethylazetidin-1-yl)methanone I-467 11K N-[6-chloro-5-(6-methyl-1,1-dioxido-1,2,6- thiadiazinan-2-yl)-3,4′-bipyridin-2′-yl]acetamide I-468 5AX N-[5-(adamantan-1-ylsulfamoyl)-3,4′-bipyridin-2′- yl]acetamide I-469 34K N-(6-chloro-5-{[(2,4- difluorophenyl)sulfonyl]amino}-4-ethyl-3,4′- bipyridin-2′-yl)acetamide I-470 43E N-[5-(bicyclo[1.1.1]pent-1-ylsulfamoyl)-6- methoxy-3,4′-bipyridin-2′-yl]acetamide I-471 34W 5-(cyclopentyloxy)-6-methyl-N-(2- methylpyrimidin-4-yl)-3,4′-bipyridin-2′-amine I-472 46 N-[5-(1,3-oxazol-2-ylamino)-3,4′-bipyridin-2′- yl]acetamide I-473 11D N-[6-chloro-5-(1,1-dioxido-1,2,6-thiadiazinan-2- yl)-4-methyl-3,4′-bipyridin-2′-yl]acetamide I-474 5AY N-[5-(azetidin-1-ylsulfonyl)-3,4′-bipyridin-2′- yl]acetamide I-475 34AA 6-methyl-N-(2-methylpyrimidin-4-yl)-5-phenoxy- 3,4′-bipyridin-2′-amine I-476 9CI N-(4-{4-[(dimethylsulfamoyl)amino]pyrazolo[1,5- a]pyridin-6-yl}pyridin-2-yl)acetamide I-477 9CP N-{5-[(2-azabicyclo[2.2.1]hept-2- ylsulfonyl)amino]-6-chloro-4-methyl-3,4′- bipyridin-2′-yl}acetamide I-478 9BW 2′-acetamido-6-methyl-3,4′-bipyridin-5-yl 2,4- difluorobenzenesulfonate I-479 34T 5-ethoxy-6-methyl-N-(2-methylpyrimidin-4-yl)- 3,4′-bipyridin-2′-amine I-480 34Q 6-{2-[(2-methylpyrimidin-4-yl)amino]pyridin-4- yl}pyrazolo[1,5-a]pyridin-4-amine I-481 5AP N-{5-[(4-methylpiperazin-1-yl)sulfonyl]-3,4′- bipyridin-2′-yl}acetamide I-482 53A 3,3-difluoro-N-{6-methyl-2′-[(2-methylpyrimidin- 4-yl)amino]-3,4′-bipyridin-5-yl}azetidine-1- carboxamide I-483 9BZ N-(5-{[(4,4-dimethylpiperidin-1- yl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′- yl)acetamide I-484 43T N-[4-(1,1-dioxido-3,4-dihydro-2H-pyrido b][1,4,5]oxathiazepin-8-yl)pyridin-2-yl]acetamide I-485 20AK 2′-acetamido-N-(2,4-difluorophenyl)-N,6- dimethyl-3,4′-bipyridine-5-carboxamide I-486 34O 2,4-difluoro-N-(6-{2-[(2-methylpyrimidin-4- yl)amino]pyridin-4-yl}pyrazolo[1,5-a]pyridin-4- yl)benzenesulfonamide I-487 43S N-[5-(tert-butylsulfamoyl)-6-(dimethylamino)-4- methyl-3,4′-bipyridin-2′-yl]acetamide I-488 9CO N-{6-chloro-4-methyl-5-[(pyrrolidin-1- ylsulfonyl)amino]-3,4′-bipyridin-2′-yl}acetamide I-490 11I N-[6-amino-5-(1,1-dioxido-1,2,6-thiadiazinan-2- yl)-3,4′-bipyridin-2′-yl]acetamide I-491 43Q N-{5-[(2,4-difluorophenyl)sulfamoyl]-6- (dimethylamino)-3,4′-bipyridin-2′-yl}acetamide I-492 9BV N-[5-(cyclopropylmethoxy)-6-methyl-3,4′- bipyridin-2′-yl]acetamide I-493 9CJ N-[6-chloro-4-methyl-5-({[1-methyl-3- (trifluoromethyl)-1H-pyrazol-4- yl]sulfonyl}amino)-3,4′-bipyridin-2′-yl]acetamide I-494 9CX N-(6-methyl-5- {[methyl(phenyl)sulfamoyl]amino}-3,4′-bipyridin- 2′-yl)acetamide I-495 20AR (3,3-dimethylazetidin-1-yl){6-methyl-2′-[(2- methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5- yl}methanone I-496 55a N-{5-[4-(dimethylamino)-1,1- dioxidoisothiazolidin-2-yl]-6-methyl-3,4′- bipyridin-2′-yl}acetamide (peak 1) I-497 55b N-{5-[4-(dimethylamino)-1,1- dioxidoisothiazolidin-2-yl]-6-methyl-3,4′- bipyridin-2′-yl}acetamide (peak 2) I-498 9CL N-{5-[(dimethylsulfamoyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}-2,2- difluorocyclopropanecarboxamide (peak 1) I-499 9CM N-{5-[(dimethylsulfamoyl)amino]-6-methyl-3,4′- bipyridin-2′-yl}-2,2- difluorocyclopropanecarboxamide (peak 2) General Synthetic Methods and Intermediates:

The compounds of the present invention can be prepared by methods known to one of ordinary skill in the art and/or by reference to the schemes shown below and the synthetic examples that follow. Exemplary synthetic routes are set forth in the Schemes below, and in the Examples. The person skilled in the art will understand that the synthetic schemes presented herein can be adapted for the preparation of regioisomeric compounds (e.g., compounds where, for example an R⁴ group is located at a different position on the ring than that depicted in the exemplary schemes) or compounds comprising a different number of substituent groups (e.g., additional R⁴ groups).

One of ordinary skill in the art will recognize that numerous variations in reaction conditions including variations in solvent, reagents, catalysts, reaction temperatures and times are possible for each of the reactions described. Variation of order of synthetic steps and alternative synthetic routes are also possible.

Scheme 1 shows a general route for the preparation of compounds of formula I-A, I-B, or I-C (e.g., compounds of formula I-A′, I-B′, or I-C′) starting from R⁴-substituted 5-bromopyridine-3-sulfonyl chloride ii (e.g., 2-amino-5-bromopyridine-3-sulfonyl chloride). See Banka et al., Intl. App. Pub. No. WO 2012/037108. Treatment of ii with an amine in the presence of an appropriate base provides access to sulfonamide containing material iii where R¹ is a variously substituted nitrogen (Method A). Alternatively, treatment of ii with hydrazine followed by base and an alkyl or benzyl halide provides variously substituted sulfones of iii (Method B). Additionally, treatment of ii with aqueous acid can provide the sulfonic acid (Method C). The resulting sulfonamides or sulfones can undergo Suzuki coupling with a suitable boron reagent (Method D) using, for example, Pd(dppf)Cl₂, Pd(amphos)Cl₂, XPhosG3/XPhos (see Buchwald, S. L. et. Al, Chem. Sci., 2013, 4, 916-920), Pd(PPh₃)₄ or SiliaCat DPP-Pd as a catalyst, K₂CO₃, Cs₂CO₃ or K₃PO₄ as base in suitable solvent such as dioxane at elevated temperatures to afford compounds of formula I-A, I-B, or I-C (for similar procedures, see A. Suzuki, J. Organometallic Chem. 1999, 576, 147-168; Pagliaro et al., Org. Process Res. Dev. 2012, 16, 117-122). Stille coupling with an organotin species using conditions such as Pd(PPh₃)₄, CuI and LiCl in a suitable solvent such as dioxane (Method E) can also be used to generate compounds I-A, I-B, or I-C (for a review of the Stille reaction, see W. J. Scott et al., “The Stille Reaction” Organic Reations, 2004, Wiley: Online). Note that compounds similar to I-A, I-B, or I-C wherein R⁴ is substituted at a different position on the pyridine ring can be prepared using the reaction as shown in Scheme 1.

Scheme 2 shows a general route for the preparation of compounds of formula I-D starting from 2-substituted-4-bromopyridines iv. Other suitable 2-substituted pyridines (e.g., 2-substituted-4-chloropyridines or 2-substituted-4-iodopyridines) can also be used. Compounds of formula v can be obtained by displacement with an appropriate amine when X′=halogen (Method F), acylation when X′═NH₂ (Method G) or Curtius rearrangement when X′=carboxylic acid (Method H). Alternatively, when X′=halogen, Buchwald-Hartwig amination using an appropriate amine with a suitable catalyst system such as Pd₂(dba)₃/xantphos or Pd(dppf)Cl₂, and a suitable base such as Cs₂CO₃ or t-BuOK in an appropriate solvent can be employed to obtain compounds of formula v (Method L) (for similar procedures, see Driver, M. S., Hartwig, J. F., J. Am. Chem. Soc. 1996, 118, 7217-7218 and Yin, J., et. al., Org. Lett. 2002, 4, 3481). The coupling of compound v with the appropriately substituted boron reagent (Method D) or organotin species (Method E) affords compounds of formula I-D. Note that compounds similar to I-D wherein R⁴ is substituted at a different position on the pyridine ring can be prepared using the reaction as shown in Scheme 2.

Scheme 3 shows a general route for the preparation of compounds of formula I-E starting from variously substituted 3-amino-pyridines vi. Treatment of vi with an appropriately substituted sulfonyl chloride in the presence of a suitable base such as pyridine provides access to compounds of the formula vii where R¹⁰═H (Method J; see: Lebegue, N. et. al. J. Med. Chem. 2005, 48, 7363-7373). These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-E. Alternatively, compounds of the formula vii where R¹⁰═H can be further reacted in the presence of a base and an electrophile such as an alkyl halide, acyl halide or sulfonyl chloride to afford di-substituted sulfonamides of the formula vii where R¹⁰ is as defined herein. These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-E.

Scheme 4 shows a general route for the preparation of compounds of formula I—F and I-G starting from variously substituted pyridines with a carboxylic acid moiety at the 3-position. Treatment of viii with an amine ix and an appropriate coupling reagent such as TBTU in an appropriate solvent such as DCM affords amides of the formula x. These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-F. Alternatively, compounds of the formula x where R⁹═H can be further reacted in the presence of a base and an electrophile such as an alkyl halide to afford di-substituted amides of the formula x where R⁹ is as defined herein. These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-F. Alternatively, if intermediate x is a Weinreb amide (for an example of Weinreb amide preparation, see: Sun, X. et. al. Intl. App. Pub. No. WO 2012/009227 A1), treatment with an appropriately substituted Grignard reagent in a solvent such as THF is a method that can be used to generate compounds of the formula xii which can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-G.

Scheme 5 shows a general route for the preparation of compounds I-H from starting materials xiii. Reaction with sulfonyl halides (Method J) or alkyl halides (Method K) under basic conditions in an appropriate solvent such as THF or DCM can provide compounds xiv. Further treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E) affords compounds of formula I-H.

Scheme 6 shows a general route for the preparation of compounds I-I from starting materials vi (see, e.g., Scheme 3). Treatment of compounds vi with the appropriately substituted boron reagent (Method D) or organotin species (Method E) affords compounds of formula xv. Further treatment using Method J leads to the final compounds I-I.

Scheme 7 shows a general route for the preparation of substituted bipyridyls I-J from starting materials xvi. Treatment of xvi with an oxidant such as mCPBA leads to the intermediates xvii. Further treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E) affords compounds of formula I-J.

Scheme 8 shows a general route for the preparation of compounds I-K from starting material xviii. Reaction of the amine in the 3-position in xviii with cyclopropanecarboxaldehyde xix under acidic conditions in a suitable solvent such as DCM provides the intermediate imine, which can then be reduced with an appropriate reagent such as NaBH(OAc)₃ in a suitable solvent such as DCM to provide intermediate xx. Intermediate xxi can be generated from xx by treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E). Compounds xxi can be further transformed by reaction with sulfamide under basic conditions to provide compounds of formula I-K.

Scheme 9 shows a general route for formation of compounds I-L from starting materials xxii. Aldehyde xxii can be treated with a ketone under basic conditions in a suitable solvent, such as methanol, to provide the intermediates xxiv. Compounds xxiv can undergo further treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-L.

Scheme 10 shows a general route for the formation of compounds I-M from starting materials xxv. Compound xxv can be treated under Method J to provide the sulfonamides xxvi, which can undergo further treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-M.

Scheme 11 shows a general route for the preparation of compounds I-N from starting material xxvii. Compound xxvii can be treated with chlorosulfonic acid to provide the sulfonyl chloride xxviii. Treatment of xxviii with disubstituted amines in a suitable solvent such as DCM provides intermediates xxx Compounds xxx can undergo further treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-N.

Scheme 12 shows a general route for the preparation of compounds I-O from starting materials xxxi. Treatment of xxxi with paraformaldehyde under acidic conditions in a suitable solvent such as iPrOH provides intermediates xxxii. Compounds xxxii can be further treated with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-O.

Scheme 13 shows a general route for the preparation of compounds I-P from starting materials xxxiii. Compound xxxiii can be treated under Method J or Method K to provide intermediates xxxiv, which can be further transformed by treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-P.

Scheme 14 shows a general route for the preparation of compounds I-Q from starting materials xxxv Compound xxxv can be treated with disubstituted disulfides under basic conditions such as sodium hydride in an appropriate solvent such as DMF to provide sulfide intermediates xxxvii, which can be further transformed by oxidation with mCPBA in a suitable solvent such as DMF to provide intermediates xxxviii. Compounds xxxviii can be further transformed by treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-Q.

Scheme 15 shows a general route for the preparation of compounds I-R from starting material xxxix. Compound xxxix can be transformed by treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford intermediates xl. The acyl group of compounds xl can be removed under basic conditions in an appropriate solvent such as methanol to provide intermediates xli. This intermediate can be further transformed by reaction with an acyl or alkyl halide under basic conditions in an appropriate solvent such as THF or DCM to provide compounds of the formula I-R.

Scheme 16 shows a general route for the preparation of compounds I-S from starting materials xlii. Compound xlii can be treated with paraformaldehyde in a suitable solvent, such as butanol, followed by treatment with a disubstituted amine at elevated temperature to provide intermediates xliv. Compounds xliv can undergo treatment with the appropriately substituted boron reagent (Method D) or organotin species (Method E) affords compounds of formula I-S.

Scheme 17 shows a general route for the preparation of compounds of formula I-T starting from 2-substituted 4-bromo-pyridines xlvii. Treatment of compound xlvii with tin chloride provides compound xlviii, which reacts with trimethoxymethane to provide compounds xlix. The coupling of compound xlix with the appropriately substituted boron reagent (Method D) or organotin species (Method E) affords compounds of formula I-T.

Scheme 18 shows a general route for the preparation of compounds of formula I-U using starting materials I, where X′ and X″ can be various groups. For example, starting from 2,4-halo-substituted pyridines 1 (X′ and X″ are both independently halo), compounds of formula li can be obtained by acylation when X′═NH₂ (Method G) or Curtius rearrangement when X′=carboxylic acid (Method H). The coupling of compound li with the appropriately substituted boron reagent (Method D) or organotin species (Method E) affords compounds of formula I-U. Compounds of formula li can be obtained by displacement with an appropriate amine when X′=halogen (Method F), acylation when X′═NH₂ (Method G) or Curtius rearrangement when X′=carboxylic acid (Method H). Alternatively, when X′=halogen, Buchwald-Hartwig amination using an appropriate amine with a suitable catalyst system such as Pd₂(dba)₃/xantphos or Pd(dppf)Cl₂, and a suitable base such as Cs₂CO₃ or t-BuOK in an appropriate solvent can be employed to obtain compounds of formula li (Method L) (for similar procedures, see Driver, M. S., Hartwig, J. F., J. Am. Chem. Soc. 1996, 118, 7217-7218 and Yin, J., et. al., Org. Lett. 2002, 4, 3481). The coupling of compound li with the appropriately substituted boron reagent (Method D) or organotin species (Method E) affords compounds of formula I-U.

Scheme 19 shows a general route for the preparation of compounds of formula I-V starting from variously substituted 3-amino-pyridines lii. Treatment of lii with an appropriately substituted sulfonyl chloride in the presence of a suitable base such as pyridine or LiHMDS provides access to compounds of the formula liii where R¹⁰═H (Method J). These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-V. Alternatively, compounds of the formula liii where R¹⁰═H can be further reacted in the presence of a base and an electrophile such as an alkyl halide, acyl halide or sulfonyl chloride to afford di-substituted sulfonamides of the formula liii where R¹⁰ is as defined herein. These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-V.

Scheme 20 shows a general route for the preparation of compounds of formula I-W starting from variously substituted 3-amino-pyridines liv. Treatment of liv with an appropriately substituted acid chloride in the presence of a suitable base such as pyridine provides compounds of the formula lv where R¹⁰═H (Method M). These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-W. Alternatively, compounds of the formula lv where R¹⁰═H can be further reacted in the presence of a base and an electrophile such as an alkyl halide, acyl halide or sulfonyl chloride to afford di-substituted sulfonamides of the formula lv where R¹⁰ is as defined herein. These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-W.

Scheme 21 shows a general route for the preparation of compounds of formula I-X and I-Y starting from variously substituted pyridines lvi with a carboxylic acid moiety at the 3-position. Treatment of lvi with an amine and an appropriate coupling reagent such as TBTU in an appropriate solvent such as DCM affords amides of the formula lvii. These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-X. Alternatively, compounds of the formula lvii where R⁹═H can be further reacted in the presence of a base and an electrophile such as an alkyl halide to afford di-substituted amides of the formula lvii where R⁹ is as defined herein. These intermediates can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-X. Alternatively, halides of formula lvii can be converted to boronic esters and/or boronic acids lviii by reaction with bis(pinacolato)diboron in the presence of a catalyst such as Pd(dppf)Cl₂ and a base such as KOAc. The intermediates lviii can be coupled with the appropriately substituted halogen reagent (Method D) to afford compounds of formula I-X. Alternatively, if intermediate lvii is a Weinreb amide (for an example of Weinreb amide preparation, see: Sun, X. et. al. Intl. App. Pub. No. WO 2012/009227 A1), treatment with an appropriately substituted Grignard reagent in a solvent such as THF generates compounds of the formula lix which can be coupled with the appropriately substituted boron reagent (Method D) or organotin species (Method E) to afford compounds of formula I-Y.

The compounds of the present invention can be prepared by methods known to one of ordinary skill in the art and/or by reference to the schemes shown below and the synthetic examples that follow.

4. Uses, Formulation and Administration

As discussed above, the present invention provides compounds that can be useful as inhibitors of VPS34, and thus the present compounds can be useful for treating proliferative, inflammatory, cardiovascular, or proliferative disorders (such as tumor and/or cancerous cell growth) mediated by VPS34. In particular, the compounds can be useful in the treatment of cancers in a subject, including, but not limited to, lung and bronchus, including non-small cell lung cancer (NSCLC), squamous lung cancer, bronchioloalveolar carcinoma (BAC), adenocarcinoma of the lung, and small cell lung cancer (SCLC); prostate, including androgen-dependent and androgen-independent prostate cancer; breast, including metastatic breast cancer; pancreas; colon and rectum; thyroid; liver and intrahepatic bile duct; hepatocellular; gastric; endometrial; melanoma; kidney; and renal pelvis, urinary bladder; uterine corpus; uterine cervix; ovary, including progressive epithelial or primary peritoneal cancer; multiple myeloma; esophagus; acute myelogenous leukemia (AML); chronic myelogenous leukemia (CML), including accelerated CML and CML blast phase (CML-BP); lymphocytic leukemia; myeloid leukemia; acute lymphoblastic leukemia (ALL); chronic lymphocytic leukemia (CLL); Hodgkin's disease (HD); non-Hodgkin's lymphoma (NHL), including follicular lymphoma and mantle cell lymphoma; B-cell lymphoma, including diffuse large B-cell lymphoma (DLBCL); T-cell lymphoma; multiple myeloma (MM); amyloidosis; Waldenstrom's macroglobulinemia; myelodysplastic syndromes (MDS), including refractory anemia (RA), refractory anemia with ringed siderblasts (RARS), (refractory anemia with excess blasts (RAEB), and RAEB in transformation (RAEB-T); and myeloproliferative syndromes; brain, including glioma/glioblastoma, anaplastic oligodendroglioma, and adult anaplastic astrocytoma; neuroendocrine, including metastatic neuroendocrine tumors; head and neck, including, e.g., squamous cell carcinoma of the head and neck, and nasopharyngeal cancer; oral cavity; and pharynx; small intestine; bone; soft tissue sarcoma; and villous colon adenoma.

In some embodiments, compounds of the invention can be suitable for the treatment of breast cancer, bladder cancer, colon cancer, glioma, glioblastoma, lung cancer, hepatocellular cancer, gastric cancer, melanoma, squamous cell carcinoma, head and neck cancer, thyroid cancer, endometrial cancer, renal cancer, cervical cancer, pancreatic cancer, esophageal cancer, prostate cancer, brain cancer, or ovarian cancer.

In other embodiments, compounds of the invention can be suitable for the treatment of inflammatory and cardiovascular disorders including, but not limited to, allergies/anaphylaxis, acute and chronic inflammation, rheumatoid arthritis; autoimmunity disorders, thrombosis, hypertension, cardiac hypertrophy, and heart failure.

Accordingly, in another aspect of the present invention, pharmaceutical compositions are provided, wherein these compositions comprise any of the compounds as described herein, and optionally comprise a pharmaceutically acceptable carrier, adjuvant or vehicle. In certain embodiments, these compositions optionally further comprise one or more additional therapeutic agents.

It will also be appreciated that certain of the compounds of present invention can exist in free form for treatment, or where appropriate, as a pharmaceutically acceptable derivative thereof. According to the present invention, a pharmaceutically acceptable derivative includes, but is not limited to, pharmaceutically acceptable prodrugs, salts, esters, salts of such esters, or any other adduct or derivative which upon administration to a patient in need is capable of providing, directly or indirectly, a compound as otherwise described herein, or a metabolite or residue thereof. For clarity, the present invention can also include the corresponding N-oxide of the compounds of formula I.

As used herein, the term “pharmaceutically acceptable salt” refers to those salts which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of humans and lower animals without undue toxicity, irritation, allergic response and the like, and are commensurate with a reasonable benefit/risk ratio. A “pharmaceutically acceptable salt” means any non-toxic salt or salt of an ester of a compound of this invention that, upon administration to a recipient, is capable of providing, either directly or indirectly, a compound of this invention or an inhibitorily active metabolite or residue thereof. As used herein, the term “inhibitorily active metabolite or residue thereof” means that a metabolite or residue thereof is also an inhibitor of VPS34.

Pharmaceutically acceptable salts are well known in the art. For example, S. M. Berge et al., describe pharmaceutically acceptable salts in detail in J. Pharmaceutical Sciences, 1977, 66, 1-19, incorporated herein by reference. Pharmaceutically acceptable salts of the compounds of this invention include those derived from suitable inorganic and organic acids and bases. Examples of pharmaceutically acceptable, nontoxic acid addition salts are salts of an amino group formed with inorganic acids such as hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid and perchloric acid or with organic acids such as acetic acid, oxalic acid, maleic acid, tartaric acid, citric acid, succinic acid or malonic acid or by using other methods used in the art such as ion exchange. Other pharmaceutically acceptable salts include adipate, alginate, ascorbate, aspartate, benzenesulfonate, benzoate, bisulfate, borate, butyrate, camphorate, camphorsulfonate, citrate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate, glycerophosphate, gluconate, hemisulfate, heptanoate, hexanoate, hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate, laurate, lauryl sulfate, malate, maleate, malonate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate, palmitate, pamoate, pectinate, persulfate, 3-phenylpropionate, phosphate, picrate, pivalate, propionate, stearate, succinate, sulfate, tartrate, thiocyanate, p-toluenesulfonate, undecanoate, valerate salts, and the like. Salts derived from appropriate bases include alkali metal, alkaline earth metal, ammonium and N⁺(C₁₋₄alkyl)₄ salts. This invention also envisions the quaternization of any basic nitrogen-containing groups of the compounds disclosed herein. Water or oil-soluble or dispersable products may be obtained by such quaternization. Representative alkali or alkaline earth metal salts include sodium, lithium, potassium, calcium, magnesium, and the like. Further pharmaceutically acceptable salts include, when appropriate, nontoxic ammonium, quaternary ammonium, and amine cations formed using counterions such as halide, hydroxide, carboxylate, sulfate, phosphate, nitrate, loweralkyl sulfonate and aryl sulfonate.

As described above, the pharmaceutically acceptable compositions of the present invention additionally comprise a pharmaceutically acceptable carrier, adjuvant, or vehicle, which, as used herein, includes any and all solvents, diluents, or other liquid vehicle, dispersion or suspension aids, surface active agents, isotonic agents, thickening or emulsifying agents, preservatives, solid binders, lubricants and the like, as suited to the particular dosage form desired. Remington's Pharmaceutical Sciences, Sixteenth Edition, E. W. Martin (Mack Publishing Co., Easton, Pa., 1980) discloses various carriers used in formulating pharmaceutically acceptable compositions and known techniques for the preparation thereof. Except insofar as any conventional carrier medium is incompatible with the compounds of the invention, such as by producing any undesirable biological effect or otherwise interacting in a deleterious manner with any other component(s) of the pharmaceutically acceptable composition, its use is contemplated to be within the scope of this invention. Some examples of materials which can serve as pharmaceutically acceptable carriers include, but are not limited to, ion exchangers, alumina, aluminum stearate, lecithin, serum proteins, such as human serum albumin, buffer substances such as phosphates, glycine, sorbic acid, or potassium sorbate, partial glyceride mixtures of saturated vegetable fatty acids, water, salts or electrolytes, such as protamine sulfate, disodium hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, zinc salts, colloidal silica, magnesium trisilicate, polyvinyl pyrrolidone, polyacrylates, waxes, polyethylene-polyoxypropylene-block polymers, wool fat, sugars such as lactose, glucose and sucrose; starches such as corn starch and potato starch; cellulose and its derivatives such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; powdered tragacanth; malt; gelatin; talc; excipients such as cocoa butter and suppository waxes; oils such as peanut oil, cottonseed oil; safflower oil; sesame oil; olive oil; corn oil and soybean oil; glycols; such a propylene glycol or polyethylene glycol; esters such as ethyl oleate and ethyl laurate; agar; buffering agents such as magnesium hydroxide and aluminum hydroxide; alginic acid; pyrogen-free water; isotonic saline; Ringer's solution; ethyl alcohol, and phosphate buffer solutions, as well as other non-toxic compatible lubricants such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, releasing agents, coating agents, sweetening, flavoring and perfuming agents, preservatives and antioxidants can also be present in the composition, according to the judgment of the formulator.

In yet another aspect, a method for treating a proliferative, inflammatory, or cardiovascular disorder is provided comprising administering an effective amount of a compound of formula I, or a pharmaceutical composition containing the same to a subject in need thereof. In certain embodiments of the present invention an “effective amount” of the compound of formula I or pharmaceutical composition containing the same is that amount effective for treating a proliferative, inflammatory, or cardiovascular disorder, or is that amount effective for treating cancer. In other embodiments, an “effective amount” of a compound of formula I is an amount which inhibits enzymatic activity of VPS34 and thereby blocks the resulting signaling cascades that lead to the abnormal activity of members of such cascades (e.g., growth factors, receptor tyrosine kinases, protein serine/threonine kinases, G protein coupled receptors, transmembrane receptors and phospholipid kinases and phosphatases). Still in other embodiments, an “effective amount” of a compound of formula I is an amount which inhibits enzymatic activity of VPS34 and thereby leads to abnormal activity of degradation pathways mediated by the proteasome or lysosome.

The compounds and compositions, according to the method of the present invention, may be administered using any amount and any route of administration effective for treating the disease. The exact amount required will vary from subject to subject, depending on the species, age, and general condition of the subject, the severity of the disorder, the particular agent, its mode of administration, and the like. The compounds of the invention are preferably formulated in dosage unit form for ease of administration and uniformity of dosage. The expression “dosage unit form” as used herein refers to a physically discrete unit of agent appropriate for the patient to be treated. It will be understood, however, that the total daily usage of the compounds and compositions of the present invention will be decided by the attending physician within the scope of sound medical judgment. The specific effective dose level for any particular patient or organism will depend upon a variety of factors including the disease being treated and the severity of the disease; the activity of the specific compound employed; the specific composition employed; the age, body weight, general health, sex and diet of the patient; the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coincidental with the specific compound employed, and like factors well known in the medical arts. The term “patient”, as used herein, means an animal, preferably a mammal, and most preferably a human.

The pharmaceutically acceptable compositions of this invention can be administered to humans and other animals orally, rectally, parenterally, intracisternally, intravaginally, intraperitoneally, topically (as by powders, ointments, or drops), bucally, as an oral or nasal spray, or the like, depending on the severity of the infection being treated. In certain embodiments, the compounds of the invention may be administered orally or parenterally at dosage levels of about 0.01 mg/kg to about 200 mg/kg (e.g., from about 0.1 mg/kg to about 50 mg/kg or from about 1 mg/kg to about 25 mg/kg), of subject body weight per day, one or more times a day, to obtain the desired therapeutic effect.

Liquid dosage forms for oral administration include, but are not limited to, pharmaceutically acceptable emulsions, microemulsions, solutions, suspensions, syrups and elixirs. In addition to the active compounds, the liquid dosage forms may contain inert diluents commonly used in the art such as, for example, water or other solvents, solubilizing agents and emulsifiers such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butylene glycol, dimethylformamide, oils (in particular, cottonseed, groundnut, corn, germ, olive, castor, and sesame oils), glycerol, tetrahydrofurfuryl alcohol, polyethylene glycols and fatty acid esters of sorbitan, and mixtures thereof. Besides inert diluents, the oral compositions can also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, and perfuming agents.

Injectable preparations, for example, sterile injectable aqueous or oleaginous suspensions may be formulated according to the known art using suitable dispersing or wetting agents and suspending agents. The sterile injectable preparation may also be a sterile injectable solution, suspension or emulsion in a nontoxic parenterally acceptable diluent or solvent, for example, as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution, U.S.P. and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose any bland fixed oil can be employed including synthetic mono- or diglycerides. In addition, fatty acids such as oleic acid are used in the preparation of injectables.

The injectable formulations can be sterilized, for example, by filtration through a bacterial-retaining filter, or by incorporating sterilizing agents in the form of sterile solid compositions which can be dissolved or dispersed in sterile water or other sterile injectable medium prior to use.

In order to prolong the effect of a compound of the present invention, it is often desirable to slow the absorption of the compound from subcutaneous or intramuscular injection. This may be accomplished by the use of a liquid suspension of crystalline or amorphous material with poor water solubility. The rate of absorption of the compound then depends upon its rate of dissolution that, in turn, may depend upon crystal size and crystalline form. Alternatively, delayed absorption of a parenterally administered compound form is accomplished by dissolving or suspending the compound in an oil vehicle. Injectable depot forms are made by forming microencapsule matrices of the compound in biodegradable polymers such as polylactide-polyglycolide. Depending upon the ratio of compound to polymer and the nature of the particular polymer employed, the rate of compound release can be controlled. Examples of other biodegradable polymers include poly(orthoesters) and poly(anhydrides). Depot injectable formulations are also prepared by entrapping the compound in liposomes or microemulsions that are compatible with body tissues.

Compositions for rectal or vaginal administration are preferably suppositories which can be prepared by mixing the compounds of this invention with suitable non-irritating excipients or carriers such as cocoa butter, polyethylene glycol or a suppository wax which are solid at ambient temperature but liquid at body temperature and therefore melt in the rectum or vaginal cavity and release the active compound.

Solid dosage forms for oral administration include capsules, tablets, pills, powders, and granules. In such solid dosage forms, the active compound is mixed with at least one inert, pharmaceutically acceptable excipient or carrier such as sodium citrate or dicalcium phosphate and/or a) fillers or extenders such as starches, lactose, sucrose, glucose, mannitol, and silicic acid, b) binders such as, for example, carboxymethylcellulose, alginates, gelatin, polyvinylpyrrolidinone, sucrose, and acacia, c) humectants such as glycerol, d) disintegrating agents such as agar-agar, calcium carbonate, potato or tapioca starch, alginic acid, certain silicates, and sodium carbonate, e) solution retarding agents such as paraffin, f) absorption accelerators such as quaternary ammonium compounds, g) wetting agents such as, for example, cetyl alcohol and glycerol monostearate, h) absorbents such as kaolin and bentonite clay, and i) lubricants such as talc, calcium stearate, magnesium stearate, solid polyethylene glycols, sodium lauryl sulfate, and mixtures thereof. In the case of capsules, tablets and pills, the dosage form may also comprise buffering agents.

Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like. The solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings and other coatings well known in the pharmaceutical formulating art. They may optionally contain opacifying agents and can also be of a composition that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner. Examples of embedding compositions that can be used include polymeric substances and waxes. Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like.

Compounds of this invention can also be in micro-encapsulated form with one or more excipients as noted above. The solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings, release controlling coatings and other coatings well known in the pharmaceutical formulating art. In such solid dosage forms the active compound may be admixed with at least one inert diluent such as sucrose, lactose or starch. Such dosage forms may also comprise, as is normal practice, additional substances other than inert diluents, e.g., tableting lubricants and other tableting aids such a magnesium stearate and microcrystalline cellulose. In the case of capsules, tablets and pills, the dosage forms may also comprise buffering agents. They may optionally contain opacifying agents and can also be of a composition that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner Examples of embedding compositions that can be used include polymeric substances and waxes.

Dosage forms for topical or transdermal administration of a compound of this invention include ointments, pastes, creams, lotions, gels, powders, solutions, sprays, inhalants or patches. The active component is admixed under sterile conditions with a pharmaceutically acceptable carrier and any needed preservatives or buffers as may be required. Ophthalmic formulation, ear drops, and eye drops are also contemplated as being within the scope of this invention. Additionally, the present invention contemplates the use of transdermal patches, which have the added advantage of providing controlled delivery of a compound to the body. Such dosage forms can be made by dissolving or dispensing the compound in the proper medium. Absorption enhancers can also be used to increase the flux of the compound across the skin. The rate can be controlled by either providing a rate controlling membrane or by dispersing the compound in a polymer matrix or gel.

While one or more of the compounds of this invention may be used in an application of monotherapy to treat a disorder, disease or symptom, they also may be used in combination therapy, in which the use of an inventive compound or composition (therapeutic agent) is combined with the use of one or more other therapeutic agents for treating the same and/or other types of disorders, symptoms and diseases. Combination therapy includes administration of the therapeutic agents concurrently or sequentially. Alternatively, the therapeutic agents can be combined into one composition which is administered to the patient.

In one embodiment, the compounds of this invention are used in combination with other therapeutic agents. In some embodiments, the additional therapeutic agent is selected from other inhibitors of VPS34. In other embodiments, a compound of the invention is administered in conjunction with a therapeutic agent selected from the group consisting of cytotoxic agents, radiotherapy, and immunotherapy. It is understood that other combinations may be undertaken while remaining within the scope of the invention. For example, any compound of this invention or pharmaceutically acceptable salt described herein can be administered in conjunction with a second therapeutic agent (e.g., an autophagy inducer, an EGFR inhibitor, a tyrosine kinase inhibitor (TKI), a receptor tyrosine kinase inhibitor (RTKI), or a PI3K pathway inhibitor such as an mTOR inhibitor). The combination therapy can be assayed using the tumor xenograft model described below.

In some embodiments, the therapeutic agent is gefitinib (Iressa™), erlotinib (Tarcev®), cetuximab (Erbitux®), afatinib (Gilotrif™), lapatinib (Tykerb®), panitumumab (Vectibix®), vandetanib (Caprels®), CO-1686 (N-(3-((2-((4-(4-acetylpiperazin-1-yl)-2-methoxyphenyl)amino)-5-(trifluoro methyl)pyrimidin-4-yl)amino)phenyl)acrylamide; Clovis Oncology), AZD9291 (AstraZeneca), axitinib (Inlyta®), dasatinib (Sprycel®), imatinib (Gleevec®), nilotinib (Tasigna®), pazopanib (Votrient®), sorafenib (Nexavar®), or sunitinib (Sutent®). In some embodiments, the additional therapeutic agent for use in combination therapy is erlotinib, afatinib, lapatinib, or CO-1686. In other embodiments, the additional therapeutic agent is selected from gefitinib, vandetanib, and panitumumab. In still other embodiments, the additional therapeutic agent is cetuximab.

Combination therapy can be administered with any of the compounds of the invention described herein, or a pharmaceutically acceptable salt thereof. In some embodiments, the compound is selected from the compounds of Table 1, or pharmaceutically acceptable salts thereof. In other embodiments, the compound is I-30, or a pharmaceutically acceptable salt thereof. In other embodiments, the compound is I-32, or a pharmaceutically acceptable salt thereof. In other embodiments, the compound is I-41, or a pharmaceutically acceptable salt thereof. In other embodiments, the compound is I-94, or a pharmaceutically acceptable salt thereof. In other embodiments, the compound is I-153, or a pharmaceutically acceptable salt thereof. In other embodiments, the compound is I-214, or a pharmaceutically acceptable salt thereof. In other embodiments, the compound is I-299, or a pharmaceutically acceptable salt thereof. In other embodiments, the compound is I-308, or a pharmaceutically acceptable salt thereof.

The additional agents may be administered separately from a provided combination therapy, as part of a multiple dosage regimen. Alternatively, those agents may be part of a single dosage form, mixed together with a compound of this invention in a single composition. If administered as part of a combination therapy, the two therapeutic agents may be submitted simultaneously, sequentially or intermittently.

Combination therapy can be used for any of the therapeutic indications described herein. In some embodiments, the combination therapy is for the treatment of a proliferative disorder (e.g., cancer) in a patient. In some embodiments, the proliferative disorder is breast cancer, bladder cancer, colon cancer, glioma, glioblastoma, lung cancer, hepatocellular cancer, gastric cancer, melanoma, squamous cell carcinoma, head and neck cancer, thyroid cancer, endometrial cancer, renal cancer, cervical cancer, pancreatic cancer, esophageal cancer, prostate cancer, brain cancer, or ovarian cancer. In some embodiments, the proliferative disorder is breast cancer, pancreatic cancer, head and neck cancer, non-small-cell lung carcinoma (NSCLC), colon cancer, renal cell carcinoma, squamous cell carcinoma, or thyroid cancer. In other embodiments, the proliferative disorder is breast cancer, pancreatic cancer, head and neck cancer, non-small-cell lung carcinoma (NSCLC), or colon cancer.

As used herein, the term “combination,” “combined,” and related terms refers to the simultaneous or sequential administration of therapeutic agents in accordance with this invention. For example, a combination of the present invention may be administered with another therapeutic agent simultaneously or sequentially in separate unit dosage forms or together in a single unit dosage form.

Another aspect of the invention relates to inhibiting VPS34 activity in a biological sample or a patient, which method comprises administering to the patient, or contacting said biological sample with a compound as described herein, or a composition comprising said compound. The term “biological sample”, as used herein, generally includes in vivo, in vitro, and ex vivo materials, and also includes, without limitation, cell cultures or extracts thereof; biopsied material obtained from a mammal or extracts thereof; and blood, saliva, urine, feces, semen, tears, or other body fluids or extracts thereof.

Still another aspect of this invention is to provide a kit comprising separate containers in a single package, wherein the inventive pharmaceutical compounds, compositions and/or salts thereof are used in combination with pharmaceutically acceptable carriers to treat disorders, symptoms and diseases where VPS34 kinase plays a role.

EXEMPLIFICATION

As depicted in the Examples below, in certain exemplary embodiments, compounds are prepared according to the following general procedures. It will be appreciated that, although the general methods depict the synthesis of certain compounds of the present invention, the following general methods, and other methods known to one of ordinary skill in the art, can be applied to all compounds and subclasses and species of each of these compounds, as described herein.

Definitions

-   AA LCMS method using ammonium acetate -   Ac acetyl -   ACN acetonitrile -   AcOH acetic acid -   amphos bis(di-tert-butyl(4-dimethylaminophenyl)phosphine) -   BOC tert-butoxycarbonyl -   Bu butyl -   t-Bu tert-butyl -   C Celsius -   CDI carbonyldiimidazole -   dba dibenzylideneacetone -   DCE dichloroethane -   DCM dichloromethane -   DIAD diisopropyl azodicarboxylate -   DIEA N,N-diisopropylethylamine -   DMAP 4-dimethylaminopyridine -   DME 1,2-dimethoxyethane -   DMF N,N-dimethylformamide -   DMF-DMA N,N-dimethylformamide dimethyl acetal -   dppf 1,1′-bis(diphenylphosphino)ferrocene -   DMSO dimethylsulfoxide -   EDC N-(3-dimethylaminopropyl)-N-ethylcarbodiimide hydrochloride -   Et ethyl -   EtOAc ethyl acetate -   EtOH ethanol -   FA LCMS method using formic acid -   h hours -   HATU     1-[Bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium     3-oxide hexafluorophosphate -   HMDS hexamethyldisilazane -   HMPT hexamethylphosphorous triamide -   HPLC high pressure liquid chromatography -   IC₅₀ inhibitory concentration 50% -   LCMS liquid chromatography mass spectrometry -   m/z mass to charge -   mCPBA m-chloroperbenzoic acid -   MHz mega hertz -   Me methyl -   MeOH methanol -   min minutes -   mpk mg per kg -   MS mass spectrum -   MTBE methyl tert-butyl ether -   NaOAc sodium acetate -   NBS N-bromosuccinimide -   NMP N-methylpyrrolidinone -   NMR nuclear magnetic resonance -   po per os (by mouth or orally) -   Pr propyl -   i-Pr isopropyl -   psi pounds per square inch -   qd quaque die (every day) -   rac racemic -   rt room temperature -   SiliaCat DPP-Pd diphenylphosphine palladium (II) heterogeneous     silica-based catalyst -   STAB sodium triacetoxyborohydride -   T3P 1-propanephosphonic acid cyclic anhydride -   Tf trifluoromethanesulfonyl -   TEA triethylamine -   TFA trifluoroacetic acid -   THF tetrahydrofuran -   TBTU O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium     tetrafluoroborate -   UPLC ultra performance liquid chromatography -   Xantphos 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene -   Xphos 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl -   XPhosG3     (2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)     methanesulfonate     Analytical Methods     NMR Conditions:

¹H NMR spectra are run on a 400 MHz Bruker or Varian spectrometer unless otherwise stated.

LCMS Conditions:

LCMS spectra were recorded on a Hewlett-Packard HP1100 or Agilent 1100 Series LC system connected to a Micromass mass spectrometer using reverse phase C18 columns. Various gradients and run times were selected in order to best characterize the compounds. Mobile phases were based on ACN/water gradients and contained either 0.1% formic acid (methods indicated as FA) or 10 mM ammonium acetate (methods indicated as AA). One example of a solvent gradient that was used was 100% mobile phase A (mobile phase A=99% water+1% ACN+0.1% formic acid) to 100% mobile phase B (mobile phase B=95% ACN+5% water+0.1% formic acid) at a flow rate of 1 mL/min for a 16.5 min run.

In some cases, LCMS spectra were recorded on an Agilent 1290 Infinity UPLC system connected to an Agilent 6130 mass spectrometer, a Waters Acquity UPLC system connected to a Waters Acquity SQ mass spectrometer, or an Agilent 1100 Series HPLC system connected to a Waters Micromass ZQ mass spectrometer using reverse phase C18 columns. Various gradients and run times were selected in order to best characterize the compounds. Mobile phases were based on ACN/water gradients and contained either 0.1% formic acid (methods indicated as FA) or 10 mM ammonium acetate (methods indicated as AA). One example of a solvent gradient that was used was 95% mobile phase A (mobile phase A=99% water+1% ACN+0.1% formic acid) to 100% mobile phase B (mobile phase B=95% ACN+5% water+0.1% formic acid) at a flow rate of 0.5 mL/min for a 5 min run.

Preparative HPLC:

Preparative HPLC are conducted using 18×150 mm Sunfire C-18 columns eluting with water-MeCN gradients using a Gilson instrument operated by 322 pumps with the UV/visible 155 detector triggered fraction collection set to between 200 nm and 400 nm. Mass gated fraction collection is conducted on an Agilent 1100 LC/MSD instrument.

One of ordinary skill in the art will recognize that modifications of the gradient, column length, and flow rate are possible and that some conditions may be suitable for compound characterization than others, depending on the chemical species being analyzed.

Preparative SFC:

Preparative SFC is conducted using 10, 20 or 30 mm×250 mm ChiralPak columns (typically IA, IB, IC, ID, IE and IF) eluting with appropriate percentages of supercritical carbon dioxide and alcohol containing 0.3% diethyl amine or 0.3% triethylamine or 0.3% formic acid or without any acid or base additives. Isocratic conditions with flow rates in the range of 10-100 mL/min and a column temperature of 40° C. are typical. A Jasco SFC prep purification system with UV/visible triggered fraction collection set to between 200 nm and 400 nm and back pressure regulation set to 10 MPa.

One of ordinary skill in the art will recognize that modifications of the gradient, column length, and flow rate are possible and that some conditions may be suitable for compound characterization than others, depending on the chemical species being analyzed.

X-Ray Powder Diffraction (XRPD) Conditions:

XRPD is performed using a Bruker AXS D8 Advance X-ray Diffractometer using CuKa radiation (40 kV, 40 mA), 0-2 θ goniometer, and divergence of V4 and receiving slits, a Ge monochromator and a Lynxeye detector. Samples are run under ambient conditions as flat plate specimens using powder. The sample is gently packed into a cavity cut into polished, zero-background (510) silicon wafer. The sample is rotated in its own plane during analysis. The data are collected on an angular range of 2 to 42° 2θ, with a step size of 0.05° 2θ and a collection time of 0.5 s/step. Data collection is performed using Diffrac Plus XRD Commander v2.6.1 software. Data analysis and presentation is performed using Diffrac Plus EVA v13.0.0.2 or v15.0.0.0 software.

Example 1: Synthesis of Intermediate Boronic Acids and Stannanes N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide

Step 1: N-(4-bromopyridin-2-yl)acetamide

To a solution of 4-bromopyridin-2-amine (12.0 g, 69.4 mmol) in acetic anhydride (240 mL) was added DMAP (0.0847 g, 0.694 mmol). The reaction mixture was allowed to stir at 140° C. for 3 h and then allowed to cool to rt. Ice water was added and the pH of the mixture was adjusted to 8.5 by the addition of concentrated NH₄OH. The solid which precipitated was filtered, washed with cold water and hexanes, and dried to give N-(4-bromopyridin-2-yl)acetamide (13.3 g, 89%) as a white solid.

Step 2: N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide

To a mixture of N-(4-bromopyridin-2-yl)acetamide (17.2 g, 80 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi-1,3,2-dioxaborolane (26.4 g, 104 mmol), Pd(dppf)Cl₂ (11.7 g, 16 mmol) and KOAc (23.6 g, 240 mmol) under an atmosphere of nitrogen was added anhydrous DMF (1500 mL). The mixture was allowed to stir at 80° C. for 3.5 h. The solvent was removed and the residue was diluted with EtOAc (1000 mL). Activated carbon (100 g) was added. The slurry was heated at reflux for 5 min and then filtered. The organic solution was concentrated and the residue was recrystallized from EtOAc to give N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (6.1 g, 29%) as a white solid. ¹H NMR (400 MHz, DMSO-d₆): δ 1.29 (s, 12H), 2.09 (s, 3H), 7.24 (dd, J=6.0, 1.2 Hz, 1H), 8.30-8.33 (m, 2H), 10.47 (br s, 1H).

N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]cyclopropanecarboxamide

Step 1: N-(4-bromopyridin-2-yl)cyclopropanecarboxamide

To a stirring solution of 4-bromopyridin-2-amine (200 g, 1160 mmol) in DCM (2000 mL) and pyridine (183 g, 2310 mmol) was added cyclopropanecarbonyl chloride (157 mL, 1500 mmol) dropwise at 0° C. under a nitrogen atmosphere. The reaction mixture was allowed to stir at 0° C. for 12 h then the reaction mixture was allowed to warm to rt. The reaction mixture was washed with 1N HCl solution (3×500 mL) and brine (500 mL). The organic solution was dried over Na₂SO₄, filtered and concentrated to give N-(4-bromopyridin-2-yl)cyclopropanecarboxamide (224 g, 80% yield) as a white solid. LCMS (FA): m/z=241.0 (M+H).

Step 2: N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]cyclopropanecarboxamide

A mixture of N-(4-bromopyridin-2-yl)cyclopropanecarboxamide (100 g, 415 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi-1,3,2-dioxaborolane (105 g, 415 mmol), potassium acetate (81.4 g, 830 mmol), and Pd(dppf)Cl₂ (30.4 g, 42 mmol) in 1,4-dioxane (1000 mL) was allowed to stir at 100° C. under an atmosphere of nitrogen for 12 h. The reaction mixture was allowed to cool to rt and was filtered through celite. The filtrate was concentrated and the residue was dissolved in EtOAc (1500 mL). Activated charcoal (400 g) was added and the mixture was allowed to stir at reflux for 2 h then allowed to cool to rt. The mixture was filtered and the filtrate was concentrated under vacuum. The residue was recrystallized from EtOAc: petroleum ether (1:1, 800 mL) to give N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]cyclopropanecarboxamide (111 g, 47% yield) as a white solid. ¹H NMR (400 MHz, DMSO-d₆) δ 10.79 (s, 1H), 8.36 (s, 1H), 8.34 (d, J=4.35 Hz, 1H), 7.25 (br d, J=4.02 Hz, 1H), 2.01 (m, 1H), 1.31 (s, 12H), 0.83 (br s, 4H).

N-[5-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]cyclopropanecarboxamide

Step 1: N-(2,4-dimethoxybenzyl)-4-iodo-5-methylpyridin-2-amine

A solution of 2-fluoro-4-iodo-5-methylpyridine (85 g, 340 mmol) in 1-(2,4-dimethoxyphenyl)methanamine (270 mL, 1.68 mol) was allowed to stir at 110° C. overnight. The reaction mixture was allowed to cool to rt and diluted with EtOAc. A precipitate formed and was filtered and then washed with EtOAc. The solid was purified further by column chromatography to give N-(2,4-dimethoxybenzyl)-4-iodo-5-methylpyridin-2-amine (138 g, 50%).

Step 2: N-(2,4-dimethoxybenzyl)-N-(4-iodo-5-methylpyridin-2-yl)cyclopropanecarboxamide

To a solution of DIEA (76 mL, 440 mmol) in THF (1700 mL) was added N-(2,4-dimethoxybenzyl)-4-iodo-5-methylpyridin-2-amine (85 g, 220 mmol) and cyclopropanecarbonyl chloride (27.9 mL, 310 mmol). The reaction mixture was allowed to stir at 70° C. for 12 h and then concentrated. The residue was diluted with aqueous saturated ammonium chloride and extracted with DCM. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated to give N-(2,4-dimethoxybenzyl)-N-(4-iodo-5-methylpyridin-2-yl)cyclopropanecarboxamide (130 g, 80%) which was used in the next step without purification.

Step 3: N-(4-iodo-5-methylpyridin-2-yl)cyclopropanecarboxamide

A solution of N-(2,4-dimethoxybenzyl)-N-(4-iodo-5-methylpyridin-2-yl)cyclopropanecarboxamide (65 g, 144 mmol) and TFA (833 mL, 4.13 mol) in DCM (850 mL) was allowed to stir at rt overnight. The reaction mixture was concentrated and the residue was redissolved in DCM. Aqueous sodium bicarbonate was added and the solution was extracted with DCM. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The residue was purified by column chromatography to give N-(4-iodo-5-methylpyridin-2-yl)cyclopropanecarboxamide (60 g, 70%).

Step 4: N-[5-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]cyclopropanecarboxamide

A mixture of N-(4-iodo-5-methylpyridin-2-yl)cyclopropanecarboxamide (20 g, 66 mmol). 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi-1,3,2-dioxaborolane (33.6 g, 132 mmol) and potassium acetate (19.4 g, 198 mmol) in DMSO (200 mL) was degassed with nitrogen for 20 min. Pd(dppf)Cl₂ (5.4 g, 7 mmol) was added and the mixture was again degassed with nitrogen for 20 min. The reaction mixture was allowed to stir at 60° C. overnight and was then allowed to cool to rt and filtered. The filtrate was diluted with EtOAc and the solution was washed with water and brine. Activated charcoal was added to the organic solution and the mixture was heated at reflux for 3 h. The mixture was filtered and the filtrate was concentrated. The residue was taken up in tert-butyl dimethylether and the resulting solid was filtered. The filtrate was concentrated and the resulting solid was washed with petroleum ether to give pure N-[5-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]cyclopropanecarboxamide (7.4 g, 37%).

methyl [4-(trimethylstannyl)pyridin-2-yl]carbamate

Step 1: dimethyl (4-bromopyridin-2-yl)imidodicarbonate

To a solution of 2-amino-4-bromopyridine (14.0 g, 81.0 mmol) in DCM (800 mL) was added DIEA (35.0 mL, 202 mmol) and methyl chloroformate (15.0 g, 162 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 1 h. Saturated aqueous NH₄Cl was added and the aqueous layer was extracted with DCM. The combined organic layers were washed with brine, and concentrated by rotary evaporation to give a brown solid which was taken on without further purification.

Step 2: methyl (4-bromopyridin-2-yl)carbamate

To a solution of (4-bromopyridin-2-yl)imidodicarbonate (8.0 g, 27.7 mmol) in MeOH (150 mL) was added NaOH (2.21 g, 55.4 mmol). The reaction mixture was stirred at rt for 15 h. The reaction mixture was concentrated and then EtOAc and water were added. The aqueous layer was extracted with EtOAc. The combined organic layers were washed with brine, dried over Na₂SO₄ and concentrated by rotary evaporation to give methyl (4-bromopyridin-2-yl)carbamate (5.15 g, 81%) which was used without purification.

Step 3: methyl [4-(trimethylstannyl)pyridin-2-yl]carbamate

Under an atmosphere of nitrogen, a solution of methyl (4-bromopyridin-2-yl)carbamate (22 g, 95.2 mmol), HMPT (37.5 g, 115 mmol), Pd(PPh₃)₄ (3.3 g, 2.86 mmol) and NH₄Cl (225 mg, 4.77 mmol) in 1,4-dioxane (500 mL) was heated at 100° C. for 10 h. The mixture was filtered and concentrated. The crude compound was purified by column chromatography to give methyl [4-(trimethylstannyl)pyridin-2-yl]carbamate (13.5 g, 40%). ¹H NMR (400 MHz, CDCl₃): δ 0.34 (s, 9H) 3.09 (s, 3H), 7.10 (d, J=4.6 Hz, 2H), 7.66 (br s, 1H), 8.116 (s, 1H), 8.16 (d, J=4.6 Hz, 2H).

N-[5-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide

A mixture of N-(4-bromo-5-methylpyridin-2-yl)acetamide (30 g, 131 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi-1,3,2-dioxaborolane (40 g, 157 mmol), potassium acetate (45.2 g, 459 mmol) and Pd(dppf)Cl₂ (10.6 g, 13 mmol) in 1,4-dioxane (900 mL) was allowed to stir under an atmosphere of nitrogen at 90° C. for 18 h. The reaction mixture was diluted with EtOAc and filtered while hot. The filtrate was concentrated to give N-[5-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (18.3 g, 51%).

(rac)-2,2-difluoro-N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl) cyclopropanecarboxamide

Step 1: (rac)-N-(4-bromopyridin-2-yl)-2,2-difluorocyclopropanecarboxamide

To a solution of (rac)-2,2-difluorocyclopropanecarboxylic acid (10.0 g, 82 mmol) in DCM (250 mL) was added DIEA (53 g, 409 mmol), TBTU (60 g, 185 mmol) and 4-bromopyridin-2-amine (18.4 g, 106 mmol). The reaction mixture was heated at 45° C. for 17 h. To the reaction mixture was added water (500 mL) and the aqueous layer was extracted with EtOAc (3×300 mL). The organic layers were combined and washed with brine, dried, and concentrated in vacuo. The residue was purified by column chromatography (petroleum ether/EtOAc) to give (rac)-N-(4-bromopyridin-2-yl)-2,2-difluorocyclopropanecarboxamide as a white solid (10 g, 44%).

Step 2: (rac)-2,2-difluoro-N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl) cyclopropanecarboxamide

To a solution of (rac)-N-(4-bromopyridin-2-yl)-2,2-difluorocyclopropanecarboxamide (8.0 g, 28.9 mmol) in 1,4-dioxane (85 mL) under an atmosphere of nitrogen was added bis(pinacolato)diboron (9.5 g, 37.5 mmol), KOAc (8.4 g, 87.0 mmol) and Pd(dppf)Cl₂. The reaction mixture was heated at 75° C. for 12 h. The reaction mixture was filtered and washed with EtOAc (2×100 mL). To the filtrate was added water (500 mL) and the aqueous layer was extracted with EtOAc (2×200 mL). The combined organic layers were dried over Na₂SO₄ and concentrated by rotary evaporation. To the residue was added EtOAc (200 mL) and activated carbon (25.5 g). The mixture was stirred at 90° C. for 1 h and then filtered, rinsing with hot EtOAc (2×50 mL). The filtrated was concentrated by rotary evaporation, then taken up in EtOAc (10 mL) and petroleum ether (50 mL). The mixture was stirred for 5 min, filtered and concentrated. The residue was again taken up in EtOAc (5 mL) and petroleum ether (25 mL), stirred for 5 min, filtered and concentrated to provide (rac)-2,2-difluoro-N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl) cyclopropanecarboxamide as a white solid (5.4 g, 57%). ¹H NMR (400 MHz, CDCl₃): δ 1.34 (s, 12H), 1.77 (m, 1H), 2.25 (m, 1H), 2.46 (m, 1H), 7.42 (d, J=4.8 Hz, 1H), 8.31 (d, J=4.8 Hz, 1H), 8.54 (s, 1H), 8.99 (s, 1H).

N-(1,3-oxazol-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amine

Step 1: ethyl 2-[(4-bromopyridin-2-yl)amino]-1,3-oxazole-5-carboxylate

To a mixture of 2-amino-oxazole-5-carboxylic acid ethyl ester (0.483 g, 3.09 mmol), tris(dba)dipalladium (0) (0.070 g, 0.077 mmol), xantphos (0.120 g, 0.208 mmol) and cesium carbonate (1.95 g, 5.98 mmol) in 1,4-dioxane (15.0 mL, 192 mmol) was added 2,4-dibromopyridine (1.078 g, 4.55 mmol). The reaction was heated in the microwave at 115° C. for 1 h. The reaction was diluted with DCM (30 mL), silica gel was added to the mixture (11 g) and the solvents were removed to absorb material onto the silica. Purification of sample by column chromatography to afford ethyl 2-[(4-bromopyridin-2-yl)amino]-1,3-oxazole-5-carboxylate (0.561 g, 58%). ¹H NMR (400 MHz, DMSO-d₆) δ 11.64 (s, 1H), 8.34 (s, 1H), 8.21 (d, J=5.3 Hz, 1H), 7.90 (s, 1H), 7.32 (dd, J=5.3, 1.6 Hz, 1H), 4.29 (q, J=7.1 Hz, 2H), 1.29 (t, J=7.1 Hz, 3H) and ethyl 2-[(2-bromopyridin-4-yl)amino]-1,3-oxazole-5-carboxylate (0.13 g, 14%). ¹H NMR (400 MHz, DMSO-d₆) δ 11.63 (s, 1H), 8.23 (d, J=5.7 Hz, 1H), 8.01-7.84 (m, 2H), 7.47 (dd, J=5.7, 2.0 Hz, 1H), 4.29 (q, J=7.1 Hz, 2H), 1.29 (t, J=7.1 Hz, 3H).

Step 2: 2-[(4-bromopyridin-2-yl)amino]-1,3-oxazole-5-carboxylic acid

A mixture of ethyl 2-[(4-bromopyridin-2-yl)amino]-1,3-oxazole-5-carboxylate (0.547 g, 1.75 mmol) and 0.50 M of potassium hydroxide in water (10.0 mL, 5.00 mmol) in reagent grade EtOH (35.0 mL, 599 mmol) was heated at 50° C. for 3 h. The reaction was cooled to rt and neutralized with the addition of 6.0 M of hydrochloric acid in water (0.880 mL, 5.28 mmol) resulting in the formation of a thick white precipitate. Collection by filtration and drying under vacuum afforded 2-[(4-bromopyridin-2-yl)amino]-1,3-oxazole-5-carboxylic acid as a white solid (0.48 g, 97%). ¹H NMR (400 MHz, DMSO-d₆) δ 13.23 (s, 1H), 11.57 (s, 1H), 8.34 (d, J=1.4 Hz, 1H), 8.20 (d, J=5.3 Hz, 1H), 7.80 (s, 1H), 7.30 (dd, J=5.3, 1.7 Hz, 1H).

Step 3: 4-bromo-N-(1,3-oxazol-2-yl)pyridin-2-amine

A mixture of 2-[(4-bromopyridin-2-yl)amino]-1,3-oxazole-5-carboxylic acid (0.481 g, 1.69 mmol), potassium carbonate (351 mg, 2.54 mmol) and silver acetate (27.3 mg, 0.164 mmol) in degassed NMP (7.7 mL, 80.0 mmol) was heated at 170° C. in the microwave for 7 min. The reaction was cooled to rt and neutralized with the addition of 6.0 M of hydrochloric acid in water (0.880 mL, 5.28 mmol) resulting in the formation of a thick white precipitate. The solvent was evaporated under reduced pressure and the residue obtained was taken up in MeOH, insolubles removed by filtration and the solution purified by column chromatography to afford 4-bromo-N-(1,3-oxazol-2-yl)pyridin-2-amine as a yellow solid (0.18 g, 43%). ¹H NMR (400 MHz, DMSO-d₆) δ 11.06 (s, 1H), 8.34 (s, 1H), 8.16 (d, J=5.3 Hz, 1H), 7.75 (s, 1H), 7.22 (dd, J=5.3, 1.4 Hz, 1H), 7.08 (d, J=0.8 Hz, 1H).

Step 4: N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)oxazol-2-amine

The procedure from example 1 for N-[5-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-2-yl]acetamide was followed to provide N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)oxazol-2-amine (0.71 g, 36%). ¹H NMR (400 MHz, CDCl₃) δ 9.0 (s, 1H), 8.35-8.40 (m, 1H), 8.34 (s, 1H), 7.35 (s, 1H), 7.25-7.30 (m, 1H), 7.00 (s, 1H), 1.34 (s, 12H).

2-methyl-N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)pyrimidin-4-amine

Step 1: N-(4-chloropyridin-2-yl)-2-methylpyrimidin-4-amine

t-BuOK (1.00 M in THF, 84 mL, 84 mmol) was added to a stirring mixture of 2-bromo-4 chloropyridine (14.0 g, 72.7 mmol), 2-methylpyrimidin-4-amine (6.1 g, 55.9 mmol), Pd(dppf)Cl₂ (0.82 g, 1.12 mmol), and dppf (2.48 g, 4.47 mmol) in toluene (204 mL). The reaction mixture was allowed to stir at 110° C. for 16 h under a nitrogen atmosphere then was allowed to cool to rt and then concentrated. The crude compound was purified by column chromatography to provide N-(4-chloropyridin-2-yl)-2-methylpyrimidin-4-amine (10 g, 81% yield). LCMS (FA): m/z=221.0 (M+H).

Step 2: 2-methyl-N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)pyrimidin-4-amine

A solution of N-(4-chloropyridin-2-yl)-2-methylpyrimidin-4-amine (50 g, 226.6 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi-1,3,2-dioxaborolane (63.3 g, 249 mmol), and KOAc (66.7 g, 680 mmol) in anhydrous dioxane (1340 mL) was evacuated/purged with nitrogen three times. Pd(dppf)Cl₂ (24.9 g, 34.0 mmol) was added, and the resulting mixture was allowed to stir under an atmosphere of nitrogen at 110° C. for 16 h. The reaction mixture was allowed to cool to rt then the mixture was filtered through celite. The filtrate was concentrated under vacuum. The residue was washed with MTBE (300 mL) and filtered. The solid residue was added to a mixture of MTBE (2500 mL) and EtOAc (500 mL), stirred for 1 h, then filtered through celite. The filtrate was concentrated to give a residue which was washed with MTBE (300 mL) and then azeotropically coevaporated from EtOAc (1000 mL) twice to afford 2-methyl-N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)pyrimidin-4-amine (49.5 g, 35% yield) as a grey solid. ¹H NMR (400 MHz, DMSO-d₆): δ 10.47 (br s, 1H), 8.34 (br t, J=6.34 Hz, 2H), 7.80 (m, 2H), 7.15 (br d, J=4.52 Hz, 1H), 2.49 (s, 3H), 1.33 (s, 12H).

The reagents fj listed in the table below (Table 3) were prepared in an analogous fashion to that described above for Step 1 from the appropriate starting materials.

TABLE 3 Starting Material Reagent fj Reagent Chemical Structure LCMS Data

fh

LCMS (FA): m/z = 239.5 (M + H) fi

fh

LCMS (FA): m/z = 283.1 (M + H) fi

fh

LCMS (FA): m/z = 275.0 (M + H) fi

fh

LCMS (FA): m/z = 247.5 (M + H) fi

fh

LCMS (FA): m/z = 235.4 (M + H) fi

fh

LCMS (FA): m/z = 237.1 (M + H) fi

fh

LCMS (FA): m/z = 207.1 (M + H) fi

fh

LCMS (FA): m/z = 220.1 (M + H) fi

fh

LCMS (FA): m/z = 245.2 (M + H) fi

fh

LCMS (FA): m/z = 232.1 (M + H) fi

fh

LCMS (FA): m/z = 221.4 (M + H) fi

fh

LCMS (FA): m/z = 231.1 (M + H) fi

fh*

LCMS (FA): m/z = 209.0 (M + H) fi

fh

LCMS (FA): m/z = 221.1 (M + H) fi

fh

LCMS (FA): m/z = 220.0 (M + H) fi

fh*

LCMS (FA): m/z = 207.0 (M + H) fi

fh

LCMS (FA): m/z = 246.1 (M + H) fi

fh

LCMS (FA): m/z = 206.4 (M + H) fi

fh

LCMS (FA): m/z = 207.1 (M + H) fi

fh

LCMS (FA): m/z = 271.2 (M + H) fi

fh**

LCMS (FA): m/z = 262.0 (M + H) fi

fh

LCMS (FA): m/z = 237.0 (M + H) fi

fh

LCMS (FA): m/z = 252.1 (M + H) fi

fh

LCMS (FA): m/z = 262.1 (M + H) fi

fh

LCMS (FA): m/z = 252.1 (M + H) fi

fh

LCMS (FA): m/z = 262.1 (M + H) fi

*Pd₂(dba)₃ used instead of Pd(dppf)Cl₂ in Step 1 **Pd₂(dba)₃ used instead of Pd(dppf)Cl₂ and xantphos used instead of dppf in Step 1

2-Cyclopropylpyrimidin-4-amine

A suspension of cyclopropylcarbamidine hydrochloride (1.0 g, 8.3 mmol) in sodium methoxide (0.5 M in MeOH, 16.6 mL, 8.3 mmol) was allowed to stir at rt for 30 min. The mixture was then filtered and concentrated. Ethoxyacrylonitrile (0.85 mL, 8.3 mmol) was added and the reaction was allowed to stir at 135° C. for 3 h, then allowed to cool to rt and stir for another 16 h. The reaction was concentrated and the crude product was purified by column chromatography to provide 2-cyclopropylpyrimidin-4-amine (1.10 g, 85.0%) as a solid. LCMS (FA): m/z=136.2 (M+H).

2-Phenylpyrimidin-4-amine

A solution of benzamidine (0.655 mL, 5.15 mmol) in 3-ethoxyacrylonitrile (0.500 g, 5.15 mmol) was allowed to stir at 135° C. for 3 h and was then allowed to cool to rt and stir for another 16 h. The reaction was concentrated and the crude compound was purified by column chromatography to provide 2-phenylpyrimidin-4-amine (0.545 g, 61.8%) as a solid. LCMS (FA): m/z=172.4 (M+H).

N-[2-chloro-4-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]-2,4-difluorobenzenesulfonamide

Step 1: N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide

To a solution of 5-bromo-2-chloro-4-methylpyridin-3-amine (12 g, 54 mmol) in THF (360 mL) was added a 1.0 M solution of LiHMDS in THF (108 mL, 108 mmol) at −5° C. The reaction mixture was allowed to stir at −5° C. for 10 min. To the reaction mixture was then added 2,4-difluorobenzenesulfonyl chloride (17.3 g, 81 mmol). The reaction mixture was allowed to stir at rt for 12 h. The reaction mixture was diluted with saturated NH₄Cl solution (200 mL) and extracted with EtOAc. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (11.5 g, 53%). ¹H NMR (400 MHz, CDCl₃) δ 8.37 (s, 1H), 7.72 (m, 1H), 7.00 (m, 2H), 6.70 (s, 1H), 2.64 (s, 3H).

Step 2: N-[2-chloro-4-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]-2,4-difluorobenzenesulfonamide

A mixture of N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (6.0 g, 15.1 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi-1,3,2-dioxaborolane (4.6 g, 18.1 mmol), KOAc (4.4 g, 45.3 mmol) and Pd(dppf)Cl₂ (3.3 g, 4.5 mmol) in 1,4-dioxane (80 mL) was degassed for 10 min. The reaction mixture was allowed to stir under an atmosphere of nitrogen at reflux for 12 h. The reaction mixture was cooled to rt and then filtered and concentrated. The crude compound was purified by recrystallization (EtOAc and pentane) to provide N-[2-chloro-4-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]-2,4-difluorobenzenesulfonamide (1.1 g, 16%). ¹H NMR (400 MHz, CDCl₃) δ 8.50 (s, 1H), 7.70 (m, 1H), 6.97 (s, 2H), 6.59 (s, 1H), 2.71 (s, 3H), 1.36 (s, 12H).

2,4-difluoro-N-[2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]benzenesulfonamide

Step 1: N-(5-bromo-2-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide

A mixture of 5-bromo-2-methylpyridin-3-amine (35 g, 187 mmol) and 2,4-difluorobenzenesulfonyl chloride (47.7 g, 225 mmol) in pyridine (200 mL) was allowed to stir at 80° C. for 2 h. The reaction mixture was poured into water (1000 mL) and allowed to stir at rt for 30 min. The solid was collected by filtration, washed with water (3×100 mL) and then added into a mixture of EtOAc (150 mL) and MeOH (150 mL). The mixture was allowed to stir at rt for 30 min. The suspension was filtered and the solid was dried to provide N-(5-bromo-2-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (56 g, 82%). ¹H NMR (400 MHz, DMSO-d₆) δ 10.66 (s, 1H), 8.45 (s, 1H), 7.81 (m, 1H), 7.69 (s, 1H), 7.60 (m, 1H), 7.27 (m, 1H), 2.23 (s, 3H).

Step 2: 2,4-difluoro-N-[2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]benzenesulfonamide

A mixture of N-(5-bromo-2-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (56 g, 154 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi-1,3,2-dioxaborolane (45 g, 177 mmol), KOAc (45.4 g, 463 mmol) and Pd(dppf)Cl₂ (11.3 g, 15.4 mmol) in 1,4-dioxane (600 mL) was degased for 10 min, then refilled with nitrogen gas. The reaction mixture was allowed to stir at 100° C. for 3 h. The reaction mixture was cooled to rt and then filtered. The filtrate was concentrated, then diluted with EtOAc (1500 mL). Active carbon (50 g) was added to the mixture and allowed to stir at reflux for 1 h. The mixture was filtered and concentrated again. The crude compound was washed with hot EtOAc (3×500 mL) and recrystallized in EtOAc and pentane to provide 2,4-difluoro-N-[2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]benzenesulfonamide (30 g, 47%). ¹H NMR (400 MHz, CDCl₃) δ 8.61 (s, 1H), 7.85 (s, 1H), 7.81 (m, 1H), 6.95 (m, 2H), 6.73 (m, 1H), 2.46 (s, 3H), 1.32 (s, 12H).

N,N-dimethyl-N′[2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]sulfuric diamide

Step 1: N′-(5-bromo-2-methylpyridin-3-yl)-N,N-dimethylsulfuric diamide

A mixture of 5-bromo-2-methylpyridin-3-amine (40 g, 214 mmol) and dimethylsulfamyl chloride (46.1 g, 321 mmol) in pyridine (600 mL) was allowed to stir at 40° C. for 72 h. The reaction mixture was concentrated. Then the residue was diluted with DCM and filtered to remove the solid. The filtrate was concentrated. The crude compound was purified by column chromatography to provide N-(5-bromo-2-methylpyridin-3-yl)-N,N-dimethylsulfuric diamide (30 g, 47.7%). ¹H NMR (400 MHz, DMSO-d₆) δ 9.59 (s, 1H), 8.39 (s, 1H), 7.84 (s, 1H), 2.74 (s, 6H), 2.49 (s, 3H).

Step 2: N,N-dimethyl-N′-[2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]sulfuric diamide

A mixture of N-(5-bromo-2-methylpyridin-3-yl)-N,N-dimethylsulfuric diamide (20 g, 68 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi-1,3,2-dioxaborolane (20.7 g, 81.6 mmol), KOAc (20.0 g, 204 mmol) and Pd(dppf)Cl₂ (9.95 g, 13.6 mmol) in 1,4-dioxane (224 mL) was degased for 10 min, then refilled with nitrogen gas. The reaction mixture was allowed to stir at 100° C. for 1 h. The reaction mixture was cooled to rt and then filtered. The filtrate was concentrated, then diluted with EtOAc (700 mL). Active carbon (120 g) was added to the mixture and allowed to stir at reflux for 40 min. The mixture was filtered and concentrated again. The crude compound was purified by recrystallization (EtOAc and pentane) to provide N,N-dimethyl-N′-[2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]sulfuric diamide (27.5 g, 40%). ¹H NMR (400 MHz, CDCl₃) δ 8.61 (s, 1H), 8.03 (s, 1H), 6.32 (s, 1H), 2.88 (s, 6H), 2.59 (s, 3H), 1.27 (s, 12H).

Example 2: 5-bromo-2-(methylamino)pyridine-3-sulfonyl chloride

To chlorosulfonic acid (3.58 mL, 53.8 mmol) in a flask at 0° C. was added 5-bromo-N-methylpyridin-2-amine (1.00 g, 5.35 mmol). The reaction mixture was allowed to stir at rt for 2 h, then heated at 150° C. for 3 h. The crude reaction mixture was added dropwise into a flask containing ice. The resulting precipitate was collected by filtration and dried under vacuum to afford a light yellow solid determined to be 5-bromo-2-(methylamino)pyridine-3-sulfonyl chloride (0.828 g, 54%). LCMS (FA): m/z=287.1 (M+H).

Example 3: 6-bromo-1-(cyclopropylmethyl)-1H-pyrrolo[3,2-b]pyridine

To a flask was added NaH (60% in mineral oil, 58.9 mg, 1.47 mmol) suspended in THF (7.17 mL, 88.4 mmol) and cooled to 0° C. 6-Bromo-1H-pyrrolo[3,2-b]pyridine (0.15 g, 0.74 mmol) was added and the resulting mixture was stirred at 0° C. for 30 min. Then cyclopropylmethyl bromide (0.10 mL, 1.10 mmol) was added and the reaction was stirred warming to rt overnight. The crude reaction mixture was partitioned between EtOAc and water, and extracted with EtOAc. The combined organic layers were then washed with water, followed by brine, dried using Na₂SO₄, filtered and concentrated. The residue was purified by column chromatography to afford 6-bromo-1-(cyclopropylmethyl)-1H-pyrrolo[3,2-b]pyridine (77 mg, 42%). LCMS (FA): m/z=253.0 (M+H). The intermediates listed in the table below (Table 4) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 4 Intermediate LCMS Data

LCMS (FA): m/z = 277.0 (M + H)

LCMS (FA): m/z = 351.3 (M + H)

LCMS (FA): m/z = 316.3 (M + H)

Example 4: Methyl [6-amino-5-(dimethylsulfamoyl)-3,4′-bipyridin-2′-yl]carbamate I-186

To a microwave vial was added acetamide (0.382 g, 6.47 mmol), tris(dba)dipalladium(0) (59.3 mg, 0.065 mmol), xantphos (112 mg, 0.194 mmol), cesium carbonate (591 mg, 1.81 mmol) and 1,4-dioxane (12.8 mL, 164 mmol). The reaction mixture was flushed with nitrogen and heated in the microwave at 130° C. for 60 min. The reaction mixture was concentrated in vacuo and then purified by column chromatography followed by prep HPLC to yield methyl [6-amino-5-(dimethylsulfamoyl)-3,4′-bipyridin-2′-yl]carbamate (7.0 mg, 5.7%). LCMS (AA): m/z=354.2 (M+H).

Example 5: N-[6-amino-5-(dimethylsulfamoyl)-3,4′-bipyridin-2′-yl]acetamide I-119

Step 1: 2-Amino-5-bromo-N,N-dimethylpyridine-3-sulfonamide

To a solution of 2-amino-5-bromopyridine-3-sulfonyl chloride (0.500 g, 1.84 mmol; prepared according to the procedure described in Banka et al., Intl. App. Pub. No. WO 2012/037108) and dimethylamine hydrochloride (1.59 g, 19.4 mmol) in THF (9.30 mL) was added DIEA (3.40 mL, 19.5 mmol). The reaction mixture was allowed to stir at rt overnight. The crude reaction mixture was adsorbed to silica gel and purified by column chromatography to yield 2-amino-5-bromo-N,N-dimethylpyridine-3-sulfonamide (0.446 g, 86%). LCMS (AA): m/z=280.1 (M+H).

Step 2: N-[6-amino-5-(dimethylsulfamoyl)-3,4′-bipyridin-2′-yl]acetamide

N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (0.127 g, 0.483 mmol), 2-amino-5-bromo-N,N-dimethylpyridine-3-sulfonamide (0.176 g, 0.628 mmol), potassium carbonate (134 mg, 0.966 mmol), 1,4-dioxane:water (4.26 mL, 6:1 mixture) and Pd(dppf)Cl₂ (19.9 mg, 0.024 mmol) were combined in a reaction vial, flushed with nitrogen and sealed. The reaction mixture was heated at 120° C. in an oil bath for 18 h. The reaction mixture was cooled to rt, filtered through celite and washed with DCM. The crude material was purified by prep HPLC to yield N-[6-amino-5-(dimethylsulfamoyl)-3,4′-bipyridin-2′-yl]acetamide (0.047 g, 26%). LCMS (AA): m/z=336.0 (M+H).

The compounds listed in the table below (Table 5) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 5 Starting Material Compound LCMS Example Reagent Structure No. Data 5A b

I-108 LCMS (AA): m/z = 362.0 (M + H) 5B b

I-97 LCMS (FA): m/z = 418.8 (M + H) 5C b

I-5 LCMS (FA): m/z = 391.3 (M + H) 5D b

I-148 LCMS (FA): m/z = 412.8 (M + H) 5E b

I-101 LCMS (FA): m/z = 390.3 (M + H) 5F b

I-37 LCMS (FA): m/z = 398.8 (M + H) 5G b

I-98 LCMS (FA): m/z = 434.3 (M + H) 5H b

I-204 LCMS (FA): m/z = 385.3 (M + H) 5I b

I-43 LCMS (FA): m/z = 384.2 (M + H) 5J b NH₃ I-61 LCMS (FA): m/z = 308.3 (M + H) 5K b

I-76 LCMS (FA): m/z = 412.8 (M + H) 5L b

I-24 LCMS (FA): m/z = 378.7 (M + H) 5M b

I-183 LCMS (FA): m/z = 404.8 (M + H) 5N b

I-156 LCMS (FA): m/z = 376.7 (M + H) 5O b

I-73 LCMS (FA): m/z = 364.3 (M + H) 5P b

I-207 LCMS (FA): m/z = 418.3 (M + H) 5Q b

I-19 LCMS (FA): m/z = 399.3 (M + H) 5R b

I-7 LCMS (FA): m/z = 350.6 (M + H) 5S b

I-110 LCMS (FA): m/z = 376.3 (M + H) 5T b

I-89 LCMS (FA): m/z = 322.0 (M + H) 5U* b

I-124 LCMS (FA): m/z = 364.0 (M + H) 5V* b

I-87 LCMS (AA): m/z = 362.4 (M + H) 5W a

I-137 LCMS (AA): m/z = 321.2 (M + H) b

5X a

I-49 LCMS (FA): m/z = 376.3 (M + H) b

5Y** a

I-47 LCMS (FA): m/z = 347.2 (M + H) b

5Z** c

I-120 LCMS (AA): m/z = 349.0 (M + H) 5AA b

I-166 LCMS (FA): m/z = 361.1 (M + H) d

5AB b

I-77 LCMS (FA): m/z = 392.3 (M + H) 5AC*** c

I-184 LCMS (AA): m/z = 242.0 (M + H) 5AD*** c

I-194 LCMS (AA): m/z = 256.2 (M + H) 5AE b

I-170 LCMS (FA): m/z = 421.1 (M + H) 5AF a

I-63 LCMS (FA): m/z = 434.1 (M + H) b

5AG a

I-100 LCMS (FA): m/z = 398.3 (M + H) b

5AH**** c

I-39 LCMS (FA): m/z = 399.4 (M + H) 5AI**** c

I-107 LCMS (FA): m/z = 435.3 (M + H) 5AJ a

I-173 LCMS (AA): m/z = 406.5 (M + H) b

5AK b

I-11 LCMS (FA): m/z = 374.4 (M + H) 5AL a

I-190 LCMS (FA): m/z = 359.1 (M + H) b

5AM a

I-9 LCMS (FA): m/z = 397.4 (M + H) b

5AN a

I-118 LCMS (FA): m/z = 383.5 (M + H) b

5AO*** a

I-464 LCMS (FA): m/z = 405.0 (M + H) b

5AP*** a

I-481 LCMS (FA): m/z = 376.1 (M + H) b

5AQ*** a

I-443 LCMS (FA): m/z = 349.1 (M + H) b

5AR*** a

I-321 LCMS (FA): m/z = 383.1 (M + H) b

5AS*** a

I-459 LCMS (FA): m/z = 369.1 (M + H) b

5AT*** a

I-338 LCMS (FA): m/z = 333.2 (M + H) b

5AU*** a

I-365 LCMS (FA): m/z = 383.1 (M + H) b

5AV*** a

I-396 LCMS (FA): m/z = 347.1 (M + H) b

5AW*** a

I-318 LCMS (FA): m/z = 427.1 (M + H) b

5AX*** a

I-468 LCMS (FA): m/z = 427.1 (M + H) b

5AY*** a

I-474 LCMS (FA): m/z = 333.1 (M + H) b

5AZ*** a

I-391 LCMS (FA): m/z = 369.1 (M + H) b

5BA a

I-438 LCMS (FA): m/z = 380.7 (M + H) b

*DIEA was not added in Step 1 of Example 5. **In Step 2, tetrakis(triphenylphosphine)palladium(0) and cesium carbonate were used instead of Pd(dppf)Cl₂ and potassium carbonate. ***In Step 2, the reaction mixture was heated in the microwave (120° C., 35 min). ****Starting material for step 2 was prepared from 5-bromo-2-chloro-N-phenylpyridine-3-sulfonamide according to the procedure in WO2012/037108, p. 268.

Example 6: Methyl [6-amino-5-(dimethylsulfamoyl)-3,4′-bipyridin-2′-yl]carbamate I-171

Step 1: [6-amino-5-(dimethylsulfamoyl)-3,4′-bipyridin-2′-yl]carbamate

To a microwave vial was added 2-amino-5-bromo-N,N-dimethylpyridine-3-sulfonamide (0.098 g, 0.35 mmol), methyl [4-(trimethylstannyl)pyridin-2-yl]carbamate (0.220 g, 0.700 mmol), lithium chloride (52.2 mg, 1.23 mmol), CuI (33.3 mg, 0.175 mmol) and 1,4-dioxane (3.87 mL, 49.6 mmol). The reaction mixture was flushed with argon and heated in the microwave at 110° C. for 30 min and then filtered through a short plug of celite. The celite was washed with MeOH and the supernatant concentrated by rotary evaporation. EtOAc was added to the residue and the resulting precipitate was collected in a buchner funnel. The material was purified by prep HPLC to yield methyl [6-amino-5-(dimethylsulfamoyl)-3,4′-bipyridin-2′-yl]carbamate (7.0 mg, 5.7%). LCMS (AA): m/z=352.4 (M+H).

The compounds listed in the table below (Table 6) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 6 Ex- Compound ample Reagent e No. LCMS Data 6A

I-36 LCMS (AA): m/z = 378.3 (M + H) 6B

I-34 LCMS (AA): m/z = 351.3 (M + H) 6C

I-55 LCMS (FA): m/z = 316.3 (M + H)

Example 7: N-[6-amino-5-(methylsulfonyl)-3,4′-bipyridin-2′-yl]acetamide I-95

Step 1: 2-amino-5-bromopyridine-3-sulfonohydrazide

To a solution of 2-amino-5-bromopyridine-3-sulfonyl chloride (1.41 g, 5.19 mmol) in THF (30.0 mL) was added hydrazine (0.659 mL, 21.0 mmol) and the mixture was allowed to stir at rt for 10 min. The solvent was removed by rotary evaporation to give 2-amino-5-bromopyridine-3-sulfonohydrazide which was used in the next step without purification. LCMS (AA): m/z=267/269 (M+H).

Step 2: 5-bromo-3-(methylsulfonyl)pyridin-2-amine

To 2-amino-5-bromopyridine-3-sulfonohydrazide (1.00 g, 3.74 mmol) in EtOH (21.3 mL, 364 mmol) was added sodium acetate (3.40 g, 41.5 mmol) and the mixture was refluxed for 24 h and then cooled to rt. Solvent was removed by rotary evaporation and the residue was diluted with EtOAc and water, and washed with brine. The organic layer was dried over sodium sulfate and concentrated by rotary evaporation. The crude material was purified by column chromatography to yield 5-bromo-3-(methylsulfonyl)pyridine-2-amine (0.404 g, 43.0%).

Step 3: N-[6-amino-5-(methylsulfonyl)-3,4′-bipyridin-2′-yl]acetamide

The procedure from Example 5, Step 2 was followed to yield N-[6-amino-5-(methylsulfonyl)-3,4′-bipyridin-2′-yl]acetamide (5.0 mg, 1.5%). LCMS (FA): m/z=307.2 (M+H).

The compounds listed in the table below (Table 7) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 7 Starting material Example Reagent Chemical Structure Compound No. LCMS Data 7A i

I-138 LCMS (FA): m/z = 419.3 (M + H) 7B i

I-99 LCMS (FA): m/z = 417.3 (M + H) 7C i

I-3 LCMS (FA): m/z = 433.8 (M + H) 7D i

I-126 LCMS (FA): m/z = 397.3 (M + H) 7E i

I-172 LCMS (FA): m/z = 417.3 (M ' H) 7F i

I-197 LCMS (FA): m/z = 401.3 (M + H) 7G i

I-175 LCMS (FA): m/z = 335.3 (M + H) 7H i

I-6 LCMS (FA): m/z = 383.4 (M + H) 7I i

I-205 LCMS (FA): m/z = 384.3 (M + H) 7J i

I-145 LCMS (FA): m/z = 365.3 (M + H) 7K i

I-50 LCMS (FA): m/z = 451.7 (M + H) 7L i

I-208 LCMS (FA): m/z = 347.3 (M + H) 7M i

I-69 LCMS (AA): m/z = 321.0 (M + H) 7N j

I-51 LCMS (AA): m/z = 292.2 (M + H) 7O j

I-139 LCMS (FA): m/z = 229.2 (M + H) k

Example 7P: 2′-acetamido-6-amino-3,4′-bipyridine-5-sulfonic acid I-122

Step 1: 2-amino-5-bromopyridine-3-sulfonic acid

2-amino-5-bromopyridine-3-sulfonyl chloride (92 mg, 0.34 mmol) was allowed to stir in HCl (6 M in water; 6.1 mL, 37 mmol) and ACN (2.0 mL, 38 mmol) at rt overnight. The reaction mixture was concentrated by rotary evaporation to yield 2-amino-5-bromopyridine-3-sulfonic acid (64.0 mg, 75%). LCMS (FA): m/z 253/255 (M+H).

Step 2: 2′-acetamido-6-amino-3,4′-bipyridine-5-sulfonic acid

Followed the procedure described in Step 2 of Example 5 with the following modification: Used 3.5 equivalents of 2M K₂CO₃ instead of solid potassium carbonate. No additional water was added. The reaction yielded 2′-acetamido-6-amino-3,4′-bipyridine-5-sulfonic acid (40 mg, 40.0%). LCMS (AA): m/z=309.0 (M+H).

Example 8: N-{5-[(cyclopropylsulfonyl)(methyl)amino]-6-methyl-3,4′-bipyridin-2′-yl}acetamide I-212

Step 1: N-(5-bromo-2-methylpyridin-3-yl)cyclopropanesulfonamide

A mixture of cyclopropanesulfonylchloride (372 mg, 2.65 mmol), pyridine (2.86 mL, 35.4 mmol) and 5-bromo-2-methylpyridin-3-amine (450 mg, 2.41 mmol) was allowed to stir at 80° C. overnight. Solvent was removed under reduced pressure and the residue was purified by column chromatography to yield N-(5-bromo-2-methylpyridin-3-yl)cyclopropanesulfonamide (468 mg, 66.8%). LCMS (FA): m/z=289.1; 291.1 (M+H).

Step 2: N-(5-bromo-2-methylpyridin-3-yl)-N-methylcyclopropanesulfonamide

A mixture of N-(5-bromo-2-methylpyridin-3-yl)cyclopropanesulfonamide (200 mg, 0.687 mmol), potassium carbonate (570 mg, 4.12 mmol) and methyl iodide (64.1 uL, 1.03 mmol) in THF (7.0 mL) was allowed to stir overnight at rt. The reaction mixture was filtered and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography to yield N-(5-bromo-2-methylpyridin-3-yl)-N-methylcyclopropanesulfonamide (40.0 mg, 15%) LCMS (FA): m/z=305/307 (M+H).

Step 3: N-{5-[(cyclopropylsulfonyl)(methyl)amino]-6-methyl-3,4′-bipyridin-2′-yl}acetamide

To a microwave vial were added N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (45 mg, 0.17 mmol) and potassium carbonate (125 mg, 0.924 mmol) SiliaCat DPP-Pd (81.5 mg, 0.020 mmol) and 1,4-dioxane:water (3.1 mL, 7:1 mixture) The vial was flushed with nitrogen and the reaction was heated in the microwave at 150° C. for 40 min. The reaction mixture was cooled to rt and then filtered through celite and washed with MeOH. The solvent was removed under reduced pressure and the residue was purified by column chromatography to yield N-{5-[(cyclopropylsulfonyl)(methyl)amino]-6-methyl-3,4′-bipyridin-2′-yl}acetamide (37 mg, 77%). LCMS (FA): m/z=361.2 (M+H).

The compounds listed in the table below (Table 8) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 8 Starting material Compound LCMS Example Reagent Chemical Structure No. Data 8C m

I-83 LCMS (FA): m/z = 401.3 (M + H) o

8D m

I-26 LCMS (FA): m/z = 375.5 (M + H) o

8E m

I-96 LCMS (FA): m/z = 335.1 (M + H) o CH₃I 8F m

I-46 LCMS (FA): m/z = 397.0 (M + H) o CH₃I 8G o

I-202 LCMS (FA): m/z = 361.1 (M + H) n

8O* l

I-458 LCMS (FA): m/z = 350.3 (M + H) m

o CH₃I *In Step 2, LiHMDS was used in place of K₂CO₃. In Step 3, conditions used were Pd2(dba)₃, XPhos, KOAc, Dioxane, water (110° C., 2 h).

Example 8B: N-{4-[1-(phenylsulfonyl)-1H-pyrrolo[3,2-b]pyridin-6-yl]pyridin-2-yl}acetamide I-23

Following the procedure described in Step 3 of Example 8 starting from 6-bromo-1-(phenylsulfonyl)-1H-pyrrolo[3,2-b]pyridine to yield N-{ 4-[1-(phenylsulfonyl)-1H-pyrrolo[3,2-b]pyridin-6-yl]pyridin-2-yl}acetamide (85 mg, 81%). LCMS (FA): m/z=393.0 (M+H).

The compounds listed in the table below (Table 9) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 9 Ex- Com- am- pound ple Reagent q No. LCMS Data 8H

I-67 LCMS (FA): m/z = 255.2 (M + H) 8I

I-140 LCMS (FA): m/z = 253.1 (M + H) 8J

I-116 LCMS (FA): m/z = 254.1 (M − H) 8K

I-17 LCMS (FA): m/z = 253.1 (M + H) 8L

I-93 LCMS (FA): m/z = 307.1 (M + H) 8M

I-33 LCMS (FA): m/z = 331.5 (M + H) 8N

I-199 LCMS (FA): m/z = 357.3 (M + H)

Example 9: N-(5-bromo-2-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide I-41

Step 1: N-(5-bromopyridin-3-yl)-3-chloropropane-1-sulfonamide

To a reaction vial were added 5-bromo-2-methylpyridin-3-amine (1.29 g, 6.91 mmol), pyridine (8.00 mL, 98.9 mmol) and 2,4-difluorobenzene-1-sulfonyl chloride (1.47 g, 6.91 mmol) and this reaction mixture was allowed to stir at 80° C. for 5 h. The pyridine was removed by rotary evaporation and EtOAc was added resulting in a dark yellow suspension. The solid was collected and dissolved in MeOH. A white solid precipitated out of solution upon standing. The solid was filtered and further washed with MeOH to yield N-(5-bromo-2-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (1.84 g, 73.3%). LCMS (FA): m/z=318.9/321 (M+H).

Step 2: N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′-yl)acetamide

N-(5-bromopyridin-3-yl)-3-chloropropane-1-sulfonamide (0.29 g, 0.79 mmol), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (0.27 g, 1.03 mmol), [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium (65 mg, 0.079 mmol) and cesium carbonate (0.77 g, 2.37 mmol) were taken up in 1,4-dioxane (2.16 mL) and water (0.37 mL) under an atmosphere of nitrogen. The reaction mixture was heated at 110° C. for 18 h. The reaction mixture was cooled to rt and water was added and extracted with EtOAc. The combined organic layers were washed with brine, dried over magnesium sulfate and concentrated by rotary evaporation. The crude compound was purified by column chromatography to provide N-(5-{[(2,4-difluorophenyl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′-yl)acetamide (142 mg, 43%). LCMS (FA): m/z=419.3 (M+H). ¹H NMR (500 MHz, DMSO-d₆) δ 10.65 (s, 1H), 10.60 (s, 1H), 8.67 (d, J=2.11 Hz, 1H), 8.39 (d, J=5.17 Hz, 1H), 8.28 (s, 1H), 7.83 (m, 1H), 7.73 (d, J=2.14 Hz, 1H), 7.59 (ddd, J=2.50, 9.06, 11.20 Hz, 1H), 7.38 (dd, J=1.67, 5.28 Hz, 1H), 7.24 (m, 1H), 2.36 (s, 3H), 2.14 (s, 3H).

The compounds listed in the table below (Table 10) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 10 Starting material LCMS Example Reagent Chemical Structure Compound No. Data 9A t

I-84 LCMS (AA): m/z = 383.0 (M + H) 9B t

I-30 LCMS (FA): m/z = 451.2/453.2 (M + H) 9C t

I-109 LCMS (FA): m/z = 417.2/419.1 (M + H) 9D t

I-211 LCMS (FA): m/z = 397.5 (M + H) 9E t

I-123 LCMS (FA): m/z = 413.1 (M + H) 9F t

I-111 LCMS (AA): m/z = 451.4 (M + H) 9G t

I-32 LCMS (FA): m/z = 350.3 (M + H) 9H t

I-52 LCMS (FA): m/z = 419.2 (M + H) 9I t

I-164 LCMS (FA): m/z = 423.3 (M + H) s

9J t

I-59 LCMS (FA): m/z = 419.3 (M + H) 9K t

I-74 I.CMS (FA): m/z = 413.3 (M + H) 9L t

I-168 LCMS (FA): m/z = 451.3 (M + H) 9M t

I-144 LCMS (FA): m/z = 401.2 (M + H) 9N t

I-155 LCMS (FA): m/z = 401.3 (M + H) 9O t

I-178 LCMS (FA): m/z = 411.1 (M + H) 9P t

I-80 LCMS (AA): m/z = 397.1 (M + H) 9Q t

I-131 LCMS (FA): m/z = 439.4 (M + H) 9R t

I-78 LCMS (FA): m/z = 433.5 (M + H) 9S t

I-94 LCMS (FA): m/z = 435.3 (M + H) 9T t

I-159 LCMS (FA): m/z = 449.4 (M + H) 9U t

I-143 LCMS (FA): m/z = 469.3 (M + H) 9V t

I-1 LCMS (FA): m/z = 452.3 (M + H) 9W t

I-70 LCMS (FA): m/z = 439.8 (M + H) 9X t

I-150 LCMS (FA): m/z = 419.3 (M + H) 9Y t

I-58 LCMS (FA): m/z = 431.3 (M + H) 9Z t

I-163 LCMS (FA): m/z = 431.3 (M + H) 9AA t

I-113 LCMS (FA): m/z = 501.4 (M + H) 9AB t

I-130 LCMS (FA): m/z = 429.4 (M + H) 9AC t

I-142 LCMS (FA): m/z = 427.4 (M + H) 9AD t

I-90 I.CMS (FA): m/z = 451.3 (M + H) 9AE t

I-154 LCMS (AA): m/z = 417.0 (M + H) 9AF t

I-165 LCMS (FA): m/z = 413.3 (M + H) 9AG t

I-44 LCMS (FA): m/z = 411.3 (M + H) 9AH t

I-185 I.CMS (FA): m/z = 401.3 (M + H) 9AI t

I-72 LCMS (FA): m/z = 389.3 (M + H) 9AJ t

I-134 LCMS (FA): m/z = 425.4 (M + H) 9AK t

I-12 LCMS (FA): m/z = 405.3 (M + H) s

9AL t

I-102 LCMS (FA): m/z 420.5 (M + H) s

9AM t

I-167 LCMS (FA): m/z = 321.2 (M + H) 9AN t

I-45 LCMS (FA): m/z = 384.2 (M + H) 9AO t

I-86 LCMS (FA): m/z = 535.5 (M + H) 9AP t

I-16 LCMS (AA): m/z = 481.1 (M + H) v

9AQ t

I-25 LCMS (FA): m/z = 448.4 (M + H) s

9AR t

I-31 LCMS (FA): m/z = 432.1 (M − H) s

9AS t

I-104 LCMS (FA): m/z = 435.3 (M + H) s

9AT t

I-201 LCMS (FA): m/z = 433.3 (M + H) s

9AU t

I-161 LCMS (FA): m/z = 437.2 (M + H) v

9AV t

I-4 LCMS (FA): m/z = 459.3 (M + H) v

9AW t

I-177 LCMS (FA): m/z = 433.4 (M + H) v

9AX t

I-153 LCMS (FA): m/z = 453.3 (M + H) v

9AY t

I-214 LCMS (FA): m/z = 390.0 (M + H) 9AZ t

I-244 LCMS (FA): m/z = 412.4 (M + H) v*

9BA t

I-311 LCMS (FA): m/z = 376.0 (M + H) v*

9BB t

I-267b LCMS (FA): m/z = 481.0 (M + H) Chiral sep Peak2*** v**

9BC t

I-267a LCMS (FA): m/z = 481.1 (M + H) Chiral sep Peak1*** v**

9BD t*

I-273 LCMS (FA): m/z = 364.1 (M + H) 9BE t*

I-269 LCMS (FA): m/z = 405.1 (M + H) 9BF t*

I-257 LCMS (FA): m/z = 362.1 (M + H) 9BG t*

I-274 LCMS (FA): m/z = 376.3 (M + H) 9BH u**

I-258 LCMS (FA): m/z = 435.0 (M + H) 9BI t

I-220 LCMS (FA): m/z = 366.8 (M + H) s*

9BJ s

I-411 LCMS (FA): m/z = 430.6 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9BK s

I-380 LCMS (FA): m/z = 336.4 (M + H) t

u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9BL t

I-455 LCMS (FA): m/z = 336.2 (M + H) u*

9BM s

I-394 LCMS (FA): m/z = 439.2 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9BN s

I-348 LCMS (FA): m/z = 336.2 (M + H) t

u{circumflex over ( )}{circumflex over ( )}

9BO t

I-463 LCMS (FA): m/z = 451.0 (M + H) u*

9BP s

I-372 LCMS (FA): m/z = 470.2 (M + H) t

u*

9BQ s

I-429 LCMS (FA): m/z = 441.6 (M + H) t

u*

9BR s

I-362 LCMS (FA): m/z = 476.2 (M + H) t

u*

9BS t

I-341 LCMS (FA): m/z = 404.1 (M + H) u*

9BT t

I-447 LCMS (FA): m/z = 392.1 (M + H) u*

9BU s

I-359 LCMS (FA): m/z = 351.2 (M + H) t

u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9BV {circumflex over ( )}{circumflex over ( )}

I-492 LCMS (FA): m/z = 298.1 (M + H) 9BW s

I-478 LCMS (FA): m/z = 419.9 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9BX s

I-428 LCMS (FA): m/z = 376.4 (M + H) t

u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9BY s

I-399 LCMS (FA): m/z = 470.9 (M + H) t

u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9BZ t

I-483 LCMS (FA): m/z = 418.1 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CA s

I-354 LCMS (FA): m/z = 484.9 (M + H) t

u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CB s

I-333 LCMS (FA): m/z = 518.9 (M + H) t

u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CC s

I-401 LCMS (FA): m/z = 485.0 (M + H) t

u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CD t

I-374 LCMS (FA): m/z = 426.3 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CE s

I-437 LCMS (FA): m/z = 468.0 (M + H) t^(t)

u*

9CF t

I-441 LCMS (FA): m/z = 497.0 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

v

9CG t

I-433 LCMS (FA): m/z = 461.1 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

v

9CH t

I-465 LCMS (FA): m/z = 426.3 (M + H) u^(tt)

9CI s

I-476 LCMS (FA): m/z = 375.4 (M + H) t

u^(tt)

9CJ s

I-493 LCMS (FA): m/z = 489.1 (M + H) t

u^(tt)

9CK s

I-404 LCMS (FA): m/z = 444.4 (M + H) t^(t)

u^(tt)

9CL**** t

I-498 (Peak 1) LCMS (FA): m/z = 412.4 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

v

9CM**** t

I-499 (Peak 2) LCMS (FA): m/z = 412.4 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

v

9CN t

I-445 LCMS (FA): m/z = 402.1 (M + H) u*

9CO s

I-488 LCMS (FA): m/z = 410.1 (M + H) t

u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CP s

I-477 LCMS (FA): m/z = 436.1 (M + H) t

u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CQ t

I-350 LCMS (FA): m/z = 434.2 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CR t

I-377 LCMS (FA): m/z = 419.1 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CS t

I-322 LCMS (FA): m/z = 435.0 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CT t

I-342 LCMS (FA): m/z = 415.0 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CU t

I-339 LCMS (FA): m/z = 415.1 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CV s

I-430 LCMS (FA): m/z = 493.1 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

v

9CW t

I-356 LCMS (FA): m/z = 426.1 (M + H) u{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

9CX u*

I-494 LCMS (FA): m/z = 412.1 (M + H) 9CY¹ u*

I-416 LCMS (FA): m/z = 345.3 (M + H) 9CZ u*

I-376 LCMS (FA): m/z = 345.3 (M + H) 9DA u*

I-384 LCMS (AA): m/z = 449.1 (M + H) 9DB u*

I-319 LCMS (FA): m/z = 463.2 (M + H) *Aqueous K₂CO₃ or Na₂CO₃ used in Step 2 instead of Cs₂CO₃ ^(t)Step 1 conditions use LiHMDS in THF at rt {circumflex over ( )}Step 2 conditions use Pd(PPh₃)₄, 1.0M Na₂CO₃; toluene, EtOH, microwave irradiation ^(tt)Step 2 conditions use XPhosG3; 0.500M of K₃PO₄, dioxane, microwave irradiation at 130° C. {circumflex over ( )}{circumflex over ( )}Step 2 conditions use Pd₂(dba)₃,, XPhos, KOAC, dioxane, water, 110° C. {circumflex over ( )}{circumflex over ( )}{circumflex over ( )}Step 2 conditions use K₂CO₃ instead of Cs₂CO₃ and microwave irradiation ranging from 120-150° C. **Step 2 conditions use SiliaCat DPP-Pd instead of Pd(dppf)Cl₂ and microwave irradiation ***Chiral Separation conditions Column: 5 micron Chiralpak IF (250 × 10 mm); Back Pressure Regulator value: 15 mPa Solvent: 85% CO₂/15% (0.3% DEA in MeOH); Flow Rate: 10 mL/min; Temperature: 40° C. ****Chiral Scparation conditions Column: Chiralpak IF (250 × 30 mm) 5 micron column from Chiral Technologies Solvent: Hexane/Ethanol/DEA (80/20/0.1); Flow Rale: 35 mL/min ¹Reagent u prepared as shown in Example 57

Synthesis of reagent (s) from Example 9AT: 5-bromo-2-ethylpyridin-3-amine

5-bromo-2-ethyl-3-nitropyridine (0.503 g, 2.18 mmol) was dissolved in acetic acid (4 mL, 70 mmol) and water (1 mL, 60 mmol), then iron (0.365 g, 6.53 mmol) was added and the reaction mixture was allowed to stir at rt for 3 h. Water and NaOH were added to adjust the reaction mixture to pH 8, then EtOAc was added and the mixture was filtered through celite and washed with more EtOAc. The combined organic layer was washed with water, concentrated, and the resulting residue was purified by column chromatography to yield 5-bromo-2-ethylpyridin-3-amine (0.4 g, 91%). LCMS (FA): m/z=201.1/203.1 (M+H).

Synthesis of reagent (u) from Example 9BH: 5-bromo-3-(2,4-difluorophenylsulfonamido)-2-methylpyridine 1-oxide

To N-(5-bromo-2-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (400 mg, 1.10 mmol) was added DCM (2 mL). The reaction mixture was cooled in an ice-water bath and to this solution was added mCPBA (855 mg, 4.96 mmol) portion-wise. The reaction mixture was allowed to stir and warm to rt overnight. The reaction contents were purified by column chromatography and then vacuum dried to give 5-bromo-3-(2,4-difluorophenylsulfonamido)-2-methylpyridine 1-oxide as a white solid, (0.33 g, 78%). LCMS (FA): m/z=379.0 (M+H).

Synthesis of reagent (u) from Example 9BI: N′-(5-bromo-2-methoxypyridin-3-yl)-N,N-dimethylsulfuric diamide

Dimethylsulfamoyl chloride (3.2 mL, 30 mmol) was added slowly to a solution of 3-amino-5-bromo-2-methoxypyridine (1.0 g, 4.9 mmol) in pyridine (20 mL) at −30° C. The reaction mixture was allowed to stir at rt for 16 h. The reaction mixture was concentrated and the crude compound was purified by column chromatography to provide N-(5-bromo-2-methoxypyridin-3-yl)-N,N-dimethylsulfuric diamide (0.64 g, 42%). LCMS (FA): m/z=310.1 (M+H).

Synthesis of reagent (u) from Example 9BK: 5-bromo-3-(2-methylpiperidin-1-yl)pyridine-2-carbonitrile

To a mixture of 5-bromo-3-fluoropyridine-2-carbonitrile (195 mg, 0.970 mmol) and 2-methylpiperidine (0.228 mL, 1.94 mmol) in THF (2.35 mL) was added DIEA (507 uL, 2.91 mmol). The reaction mixture was allowed to stir at rt overnight. The reaction mixture was diluted with water and extracted with EtOAc three times. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide 5-bromo-3-(2-methylpiperidin-1-yl)pyridine-2-carbonitrile (45 mg, 17%). LCMS (FA): m/z=280.2 (M+H).

Synthesis of reagent (u) from Example 9CX: N′-(5-bromo-2-methylpyridin-3-yl)-N-methyl-N-phenylsulfuric diamide

Step 1: N-(5-bromo-2-methylpyridin-3-yl)-2-oxooxazolidine-3-sulfonamide

To a solution of chlorosulfonyl isocyanate (0.140 mL, 1.60 mmol) in DCM (53.64 mL, 836.9 mmol) was added 2-chloroethanol (0.215 mL, 3.20 mmol. The reaction mixture was allowed to stir at rt for one h. To this mixture 5-bromo-2-methylpyridin-3-amine (300 mg, 1.60 mmol) and TEA (0.224 mL, 1.60 mmol) were added. The reaction mixture was allowed to stir at rt overnight. Excess DCM was removed under reduced pressure. The residue was co-evaporated with fresh DCM twice, and vacuum dried to give N-(5-bromo-2-methylpyridin-3-yl)-2-oxo-1,3-oxazolidine-3-sulfonamide, which was used without further purification. LCMS (FA): m/z=334.4 (M+) Ref: Austin; Joel, Sharma, Lisa, S.; et al

WO 2012/015723 PCT/US2011/045153 2012 1-195

Step 2: N′-(5-bromo-2-methylpyridin-3-yl)-N-methyl-N-phenylsulfuric diamide

To N-(5-bromo-2-methylpyridin-3-yl)-2-oxo-1,3-oxazolidine-3-sulfonamide (530 mg, 1.58 mmol) was added DCE (25 mL, 317 mmol). To this stirred solution N-methylaniline (0.172 mL, 1.58 mmol) and TEA (0.220 mL, 1.58 mmol) were added and the reaction mixture was allowed to stir at 80° C. After one h, additional N-methylaniline (0.25 mL) was added and the reaction mixture was allowed to stir for an additional h. Excess solvent was removed under reduced pressure and the residue was purified on a silica gel column using DCM-MeOH. Appropriate fractions were pooled together, excess solvent was removed under reduced pressure and this was vacuum dried to give N′-(5-bromo-2-methylpyridin-3-yl)-N-methyl-N-phenylsulfuric diamide in 80% purity. (70%, 0.516 mg) LCMS (FA): m/z=358.0 (M+2).

Synthesis of precursor to reagent (s) from Example 9CI: 6-bromopyrazolo[1,5-a]pyridin-4-amine

Step 1: 1,3-diamino-5-bromopyridinium 2,4,6-trimethylbenzenesulfonate

To a solution of 5-bromopyridin-3-amine (43.0 g, 249 mmol) in DCM (250 mL) at 0° C., 2-[(aminooxy)sulfonyl]-1,3,5-trimethylbenzene (64.0 g, 297 mmol; see procedure below) in DCM (250 mL) was added in a steady stream via cannula. The reaction mixture was allowed to stir at 0° C. for 1 h. To the reaction mixture, diethyl ether (600 mL) was added dropwise via addition funnel over 25 min. The reaction mixture was filtered and washed with cold diethyl ether. The solid was dried under vacuum for 30 mins to provide 1,3-diamino-5-bromopyridinium 2,4,6-trimethylbenzenesulfonate (90.0 g, 93.3%). ¹H NMR (400 MHz, DMSO-d₆) δ 8.35 (s, br, 2H), 8.14 (s, 1H), 7.94 (s, 1H), 7.49 (s, 1H), 6.90 (s, br, 2H), 6.76 (s, 2H), 2.51 (s, 6H), 2.18 (s, 3H).

Step 2: methyl 4-amino-6-bromopyrazolo[1,5-a]pyridine-3-carboxylate

To a solution of 1,3-diamino-5-bromopyridinium 2,4,6-trimethylbenzenesulfonate (90.0 g, 232 mmol) in DMF (500 mL) at 0° C., potassium carbonate (64.1 g, 464 mmol) was added. The reaction mixture was allowed to stir for 10 mins. To the reaction mixture, methyl propiolate (39.0 g, 464 mmol) was then added dropwise. The reaction mixture was allowed to warm to rt and stir overnight. The reaction mixture was poured into water (2,500 mL). The solid was collected by filtration, washed with water (500 mL×3) and dried under vacuum to provide methyl 4-amino-6-bromopyrazolo[1,5-a]pyridine-3-carboxylate (20.0 g, 32.0%). ¹H NMR (400 MHz, DMSO-d₆) δ 8.36 (s, 1H), 8.34 (s, 1H), 7.17 (s, br, 2H), 6.63 (s, 1H), 3.84 (s, 3H).

Step 3: 4-amino-6-bromopyrazolo[1,5-a]pyridine-3-carboxylic acid

A mixture of methyl 4-amino-6-bromopyrazolo[1,5-a]pyridine-3-carboxylate (20.0 g, 74.0 mmol) in aqueous sodium hydroxide solution (2.0 N, 150 mL) was allowed to stir at 60° C. for 12 h. The reaction mixture became a clear solution and was neutralized by the addition of 6N HCl to pH-3. The solid was collected by filtration and dried under vacuum to provide 4-amino-6-bromopyrazolo[1,5-a]pyridine-3-carboxylic acid (12.0 g, 63.3%). ¹H NMR (400 MHz, DMSO-d₆) δ 8.29 (s, 1H), 8.26 (s, 1H), 6.57 (s, 1H).

Step 4: 6-bromopyrazolo[1,5-a]pyridin-4-amine

A mixture of 4-amino-6-bromopyrazolo[1,5-a]pyridine-3-carboxylic acid (12.0 g, 0.78 mmol) in HBr (40%, 150 mL) was allowed to stir at 100° C. for 12 h. The reaction mixture became a clear solution and was neutralized by the addition of 4N NaOH to pH-8. The reaction mixture was extracted with DCM (150 ml×3). The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated to provide 6-bromopyrazolo[1,5-a]pyridin-4-amine (5.30 g, 53.3%). LCMS (FA): m/z=212.0 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 8.18 (s, 1H), 7.81 (m, 1H), 6.77 (m, 1H), 6.26 (m, 1H), 6.21 (s, 2H).

Synthesis of 2-[(aminooxy)sulfonyl]-1,3,5-trimethylbenzene

Step 1: tert-butyl [(mesitylsulfonyl)oxy]carbamate

To a mixture of 2,4,6-trimethylbenzenesulfonyl chloride (100 g, 457 mmol) and tert-butyl hydroxycarbamate (60.9 g, 457 mmol) in diethyl ether (1000 mL) was added TEA (46.3 g, 24.9 mmol) at 0° C. The reaction mixture was allowed to stir at 0° C. for 30 min. The reaction mixture was filtered and washed with MTBE (250 mL). The solution was concentrated at 20° C. at 150 mm Hg to remove the diethyl ether. The reaction mixture was then diluted with petroleum ether (1500 mL) and allowed to stir for 5 min. The reaction mixture was filtered and washed with petroleum ether (300 mL) to provide tert-butyl [(mesitylsulfonyl)oxy]carbamate (110 g, 76.3%). ¹H NMR (400 MHz, DMSO-d₆) δ 11.19 (s, 1H), 7.14 (s, 2H), 2.54 (s, 6H), 2.30 (s, 3H), 1.25 (s, 9H).

Step 2: 2-[(aminooxy)sulfonyl]-1,3,5-trimethylbenzene

To a solution of TFA (500 mL) at 0° C., tert-butyl [(mesitylsulfonyl)oxy]carbamate (110 g, 349 mmol) was added portion-wise over 10 min and the mixture was allowed to stir at 0° C. for another 10 min. Crushed ice was added to the mixture followed by water (500 mL). The internal temperature increased to 8° C. while a white solid appeared. The reaction mixture was filtered after 15 min. The solid was collected and washed with water until pH ˜7. The crude compound was dried for 15 min to remove excess water to provide 2-[(aminooxy)sulfonyl]-1,3,5-trimethylbenzene (64.0 g, 85.2%). The compound was unstable in the air and was used for next step directly.

Synthesis of reagent (u) from Example 9BV: 5-bromo-3-(cyclopropylmethoxy)-2-methylpyridine

To a mixture of cyclopropylmethanol (131 uL, 1.66 mmol), 5-bromo-2-methylpyridin-3-ol (250 mg, 1.30 mmol) and triphenylphosphine (420 mg, 1.60 mmol) in THF (8.3 mL) at 0° C. was added diethyl azodicarboxylate (250 uL, 1.60 mmol) dropwise. The reaction mixture was allowed to stir at rt overnight. The reaction mixture was diluted with water and extracted with DCM three times. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide 5-bromo-3-(cyclopropylmethoxy)-2-methylpyridine (120 mg, 37%). LCMS (FA): m/z=242.1 (M+H).

Synthesis of reagent (u) from Example 9CZ: 2-(bicyclo[1.1.1]pentan-1-yl)-8-bromo-3,4-dihydro-2H-pyrido[2,3-b][1,4,5]oxathiazepine 1,1-dioxide

Step 1: N-(bicyclo[1.1.1]pentan-1-yl)-5-bromo-2-chloro-N-(2-((tetrahydro-2H-pyran-2-yl)oxy)ethyl)pyridine-3-sulfonamide

A solution of N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-chloropyridine-3-sulfonamide (450 mg, 1.3 mmol) in THF (9 mL) was treated with triphenylphosphine (524 mg, 2 mmol) and tetrahydropyranoylethylene glycol (390 mg, 2.6 mmol) followed by dropwise addition of diisopropylazodcarboxylate (404 mg, 2 mmol) and the mixture was stirred ar rt for 15 h. The solvent was evaporated under reduced pressure and the residue purified by column chromatography to give N-(bicyclo[1.1.1]pentan-1-yl)-5-bromo-2-chloro-N-(2-((tetrahydro-2H-pyran-2-yl)oxy)ethyl)pyridine-3-sulfonamide (1.2 g, 96%)

Step 2: N-(bicyclo[1.1.1]pentan-1-yl)-5-bromo-2-chloro-N-(2-hydroxyethyl)pyridine-3-sulfonamide

A solution of N-(bicyclo[1.1.1]pentan-1-yl)-5-bromo-2-chloro-N-(2-((tetrahydro-2H-pyran-2-yl)oxy)ethyl)pyridine-3-sulfonamide (600 mg, 1.29 mmol) in MeOH (30 mL) was cooled in an ice bath and treated with p-toluenesulfonic acid (122 mg, 0.6 mmol). The reaction mixture was allowed to warm to rt and stirred for 15 h. A solution of NaHCO₃ in water was added until the pH was 7 and then the MeOH was evaporated under reduced pressure. The residue was extracted with DCM and the organic solution washed with water and brine, dried over MgSO₄, filtered and concentrated. The crude product purified by column chromatography to give N-(bicyclo[1.1.1]pentan-1-yl)-5-bromo-2-chloro-N-(2-hydroxyethyl)pyridine-3-sulfonamide (800 mg, 81%). LCMS: m/z=381.0.

Step 3: 2-(bicyclo[1.1.1]pentan-1-yl)-8-bromo-3,4-dihydro-2H-pyrido[2,3-b][1,4,5]oxathiazepine 1,1-dioxide

A solution of N-(bicyclo[1.1.1]pentan-1-yl)-5-bromo-2-chloro-N-(2-hydroxyethyl)pyridine-3-sulfonamide (285 mg, 0.75 mmol) in DMF (2.85 mL) was treated with NaH (35.6 mg, 0.90 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 0.5 h and then treated with water (2.8 mL) and extracted with EtOAc. The organic solution was washed with water and brine, dried over Na₂SO₄ and the solvent removed under reduced pressure. The crude product was triturated with hexane-EtOAc (50:1) to give 2-(bicyclo[1.1.1]pentan-1-yl)-8-bromo-3,4-dihydro-2H-pyrido[2,3-b][1,4,5]oxathiazepine 1,1-dioxide (433 mg, 84%). LCMS: m/z=346.0.

Synthesis of reagent (u) from Example 9DA: N-(5-bromo-2-methylpyridin-3-yl)-2,4-difluoro-N-(2-hydroxyethyl)benzenesulfonamide

A solution of N-(5-bromo-2-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (0.180 g, 0.496 mmol) in DMF (1.00 mL, 12.9 mmol) treated with 2-bromoethanol (105.4 uL, 1.487 mmol) and potassium carbonate (0.137 g, 0.991 mmol). The reaction mixture was heated in a sealed tube at 100° C. for 16 h. The reaction mixture was diluted with ice-water and the precipitate collected. The crude product was purified by column chromatography to give N-(5-bromo-2-methylpyridin-3-yl)-2,4-difluoro-N-(2-hydroxyethyl)benzenesulfonamide LCMS (FA): m/z=407.1 (M+H).

Example 9DC: N-(5-(8-fluoro-1,1-dioxido-3,4-dihydro-2H-benzo[b][1,4,5]oxathiazepin-2-yl)-[3,4′-bipyridin]-2′-yl)acetamide (I-405)

A solution of N-(5-{[(2,4-difluorophenyl)sulfonyl](2-hydroxyethyl)amino}-3,4′-bipyridin-2′-yl)acetamide in dry DMSO (0.50 mL) was treated dropwise with a 1M solution of KOt-Bu (7.71 mg, 0.0687 mmol) in THF and allowed to stir at rt. After 3 h, additional KOt-Bu (2 equivalents) was added and the mixture was allowed to stir for 72 h. The mixture was treated with AcOH (53.2 uL, 0.936 mmol) and the volatiles were evaporated under reduced pressure. The crude product was purified by column chromatography to give N-(5-(8-fluoro-1,1-dioxido-3,4-dihydro-2H-benzo[b][1,4,5]oxathiazepin-2-yl)-[3,4′-bipyridin]-2′-yl)acetamide. LCMS: m/z=429.3 (M+H).

Example 10: N-(5-{[(2-chloro-4-fluorophenyl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′-yl)acetamide I-206

Step 1: N-(5-amino-6-methyl-3,4′-bipyridin-2′-yl)acetamide

A mixture of N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (4.20 g, 16.0 mmol), 5-bromo-2-methylpyridin-3-amine (2.00 g, 10.7 mmol), cesium carbonate (10.4 g, 32.1 mmol), Pd(dppf)Cl₂ (0.88 g, 1.1 mmol) in 1,4-dioxane (36.0 mL) and water (6.0 mL) was heated to reflux for 2.5 h. After cooling to rt, water was added and the mixture was extracted with EtOAc. The combined organic layers were dried over Na₂SO₄ and concentrated by rotary evaporation. The crude compound was purified by column chromatography to provide N-(5-amino-6-methyl-3,4′-bipyridin-2′-yl)acetamide (0.94 g, 36%). LCMS (FA): m/z=243.1 (M+H).

Step 2: N-(5-{[(2-chloro-4-fluorophenyl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′-yl)acetamide

N-(5-amino-6-methyl-3,4′-bipyridin-2′-yl)acetamide (125 mg, 0.52 mmol) and 2-chloro-4-fluorobenzenesulfonyl chloride (0.09 mL, 0.62 mmol) were suspended in pyridine (1.25 mL) and heated at 110° C. overnight. The reaction was cooled and concentrated. The crude compound was purified by column chromatography to provide N-(5-{[(2-chloro-4-fluorophenyl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′-yl)acetamide (107 mg, 48%). LCMS (FA): m/z=435.1 (M+H).

The compounds listed in the table below (Table 11) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 11 Example Reagent z Compound No. LCMS Data 10A

I-62 LCMS (FA): m/z = 451.1 (M + H) 10B

I-182 LCMS (FA): m/z = 415.4 (M + H) 10C

I-114 LCMS (FA): m/z = 347.4 (M + H) 10D

I-92 LCMS (FA): m/z = 387.1 (M + H) 10E

I-128 LCMS (FA): m/z = 432.1 (M + H) 10F

I-196 LCMS (FA): m/z = 485.0 (M + H) 10G

I-18 LCMS (FA): m/z = 455.1 (M + H) 10H

I-28 LCMS (FA): m/z = 415.1 (M + H) 10I

I-203 LCMS (FA): m/z = 389.1 (M + H) 10J*

I-373 LCMS (FA): m/z = 363.1 (M + H) 10K*

I-412 LCMS (FA): m/z = 371.2 (M + H) *Aqueous K₂CO₃ or Na₂CO₃ used in Step 2 instead of Cs₂CO₃

The compounds listed in the table below (Table 11A) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 11A Compound LCMS Example Reagent x Reagent y Reagent z** No. Data 10L*

I-444 LCMS (FA): m/z = 514.9 (M + H) *Aqueous K₂CO₃ or Na₂CO₃ used in Step 1 instead of Cs₂CO₃ **1M LiHMDS and THF at rt used in Step 2

Example 10M: N-(6-chloro-5-{[(4-cyclopropyl-2-fluorophenyl)sulfonyl]amino}-4-methyl-3,4′-bipyridin-2′-yl)acetamide (I-335)

N-(6-chloro-5-{[(4-cyclopropyl-2-fluorophenyl)sulfonyl]amino}-4-methyl-3,4′-bipyridin-2′-yl)acetamide

To a mixture of N-(5-{[(4-bromo-2-fluorophenyl)sulfonyl]amino}-6-chloro-4-methyl-3,4′-bipyridin-2′-yl)acetamide (0.07 g, 0.136 mmol) and tetrakis(triphenylphosphine) palladium(0) (0.004 g, 0.003 mmol) under an atmosphere of nitrogen was added cyclopropylzinc bromide (0.50 M in THF, 3.00 mL, 1.50 mmol). The resulting solution was allowed to stir at 65° C. for 1 h. The reaction was allowed to cool to rt. The reaction mixture was diluted with EtOAc and washed with water then with brine. The organic solution was dried over Na₂SO₄, filtered, and concentrated. The crude compound was purified by HPLC to provide N-(6-chloro-5-{[(4-cyclopropyl-2-fluorophenyl)sulfonyl]amino}-4-methyl-3,4′-bipyridin-2′-yl)acetamide I-335 (0.031 g, 48.0%). LCMS (FA): m/z=475.1 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.67 (s, 1H), 10.41 (s, 1H), 8.40 (d, J=5.0 Hz, 1H), 8.05 (s, 2H), 7.53 (t, J=7.9 Hz, 1H), 7.13-7.04 (m, 2H), 7.00 (d, J=7.9 Hz, 1H), 2.16 (s, 3H), 2.11 (s, 3H), 2.01 (ft, J=8.6, 5.1 Hz, 1H), 1.10-1.00 (m, 2H), 0.83-0.76 (m, 2H).

Example 11: N-[5-(1,1-dioxidoisothiazolidin-2-yl)-3,4′-bipyridin-2′-yl]acetamide I-192

Step 1: N-(5-bromopyridin-3-yl)-3-chloropropane-1-sulfonamide

To a solution of 3-amino-5-bromopyridine (438 mg, 2.53 mmol) in pyridine (3.8 mL, 47 mmol) at 5° C. was added 3-chloropropane-1-sulfonyl chloride (0.339 mL, 2.78 mmol) dropwise. After 30 min the reaction mixture was warmed to rt and then poured into a aqueous solution of NaHCO₃. This was extracted with EtOAc and the organic layer washed with brine, dried over sodium sulfate and concentrated by rotary evaporation. The crude material residue was purified by column chromatography to yield N-(5-bromopyridin-3-yl)-3-chloropropane-1-sulfonamide (126 mg, 14.3%). LCMS (AA): m/z=312.8/314.8 (M+H).

Step 2: 3-bromo-5-(1,1-dioxidoisothiazolidin-2-yl)pyridine

To a solution of N-(5-bromopyridin-3-yl)-3-chloropropane-1-sulfonamide (126 mg, 0.402 mmol) in DMF (1.25 mL, 16.1 mmol) at rt was added NaH (60:40, sodium hydride:mineral oil, 20.1 mg, 0.502 mmol). The mixture was allowed to stir at rt for 10 min and then heated at 45° C. for 2.5 h. The mixture was partitioned between EtOAc and an aqueous solution of NaHCO₃. The aqueous layer was further extracted with EtOAc and the combined organic layers were washed with brine, dried over sodium sulfate and concentrated by rotary evaporation. The crude material residue was purified by column chromatography to yield 3-bromo-5-(1,1-dioxidoisothiazolidin-2-yl)pyridine (72 mg, 65%). LCMS (AA): m/z=277/278.9 (M+H).

Step 3: N-[5-(1,1-dioxidoisothiazolidin-2-yl)-3,4′-bipyridin-2′-yl]acetamide

Followed the procedure described in Step 2 of Example 5 with the following modification: Used 1.4 equivalents of 1M K₂CO₃ instead of solid potassium carbonate. No additional water was added. The reaction yielded N-[5-(1,1-dioxidoisothiazolidin-2-yl)-3,4′-bipyridin-2′-yl]acetamide (69.0 mg, 83.4%). LCMS (AA): m/z=333.1 (M+H).

The compounds listed in the table below (Table 12) were prepared in an analogous fashion to that described above starting from the appropriate starting materials

TABLE 12 Starting material Example Reagent Chemical Structure Compound No. LCMS Data 11A* ab

I-20 LCMS (AA): m/z = 321.0 (M + H) ac′ CH₃I 11B** aa

I-88 LCMS (FA): m/z = 347.2 (M + H) 11C*** aa

I-425 LCMS (FA): m/z = 381.0 (M + H) ac

ad

ae

11D{circumflex over ( )} aa

I-473 LCMS (FA): m/z = 396.0 (M + H) ab

ad

ae

11E{circumflex over ( )} aa

I-352 LCMS (FA): m/z = 348.1 (M + H) ab

ad

ae

11F{circumflex over ( )} aa

I-387 LCMS (FA): m/z = xxx.x (M + H) ab

ad

ae

11G{circumflex over ( )}{circumflex over ( )} ab

I-386 LCMS (FA): m/z = 362.2 (M + H) ad

ad′

11H{circumflex over ( )}{circumflex over ( )} ab

I-343 LCMS (FA): m/z = 376.2 (M + H) ad

ad′

11I{circumflex over ( )}{circumflex over ( )}{circumflex over ( )} aa

I-490 LCMS (FA): m/z = 363.6 (M + H) ab

ad

11J{circumflex over ( )}{circumflex over ( )}{circumflex over ( )} aa

I-323 LCMS (FA): m/z = 377.1 (M + H) ab

ad

ad′

11K{circumflex over ( )} aa

I-467 LCMS (FA): m/z = 396.0 (M + H) ab

ad′

ae

11L{circumflex over ( )} aa

I-448 LCMS (FA): m/z = 381.8 (M + H) ab

ad

ae

*ln Step 2, methyl iodide was used as the electrophile, NaH as the base, and DMF as the solvent. In Step 3, two equivalents of 2M 1M K₂CO₃ was used instead of 1.4 equivalents of 1M K₂CO₃. **In Step 3, the procedure described in Step 3 of Example 8 was used. ***In Step 1, Et3N was used as the base. In step 2, K₂CO₃ was used as the base, and MeOH as the solvent. {circumflex over ( )}In Step 2, K₂CO₃ was used as the base, and ACN as the solvent. Step 3 coupling conditions were Pd(PPh₃)₄; LiCl; CuI; 1,4-dioxanc; 120° C. {circumflex over ( )}{circumflex over ( )}In Step 2, K₂CO₃ was used as the base, and ACN as the solvent. Methylation of reagent ad to give reagent ad′ is described below. Final coupling with reagent ad′ used Pd(PPh₃)₄; Na₂CO₃, EtOH/Toluene; 120° C. {circumflex over ( )}{circumflex over ( )}{circumflex over ( )}In Step 2, K₂CO₃ was used as the base, and ACN as the solvent. Step 3 conditions used Pd(PPh₃)₄; Na₂CO₃, EtOH/Tolucne; 120° C.

Synthesis of reagent (ad′) from Example 11H: 2-(5-bromo-2-methylpyridin-3-yl)-6-methyl-1,2,6-thiadiazinane 1,1-dioxide

To a solution of 2-(5-bromo-2-methylpyridin-3-yl)-1,2,6-thiadiazinane 1,1-dioxide (0.773 g, 2.52 mmol), EtOH (30 mL), and MeI (0.63 mL, 10.1 mmol) was added sodium hydroxide (1M in water, 6.3 mL). The mixture was allowed stir at rt overnight. The reaction mixture was acidified with 1M HCl and then concentrated. The crude compound was purified by column chromatography to give 2-(5-bromo-2-methylpyridin-3-yl)-6-methyl-1,2,6-thiadiazinane 1,1-dioxide as an off white solid (0.81 g, 100%). LCMS (FA): m/z=320.0 (M+H).

Example 12: N-{6-amino-5-[methyl(methylsulfonyl)amino]-3,4′-bipyridin-2′-yl}acetamide I-133

Step 1: N-(2-amino-5-bromopyridin-3-yl)methanesulfonamide

To a solution of 2,3-diamino-5-bromopyridine (631 mg, 3.36 mmol) in pyridine (11 mL, 140 mmol) cooled to −10° C. was added methanesulfonyl chloride (273 uL, 3.52 mmol) dropwise. After 30 min, the mixture was warmed to rt and allowed to stir for 4 h. The mixture was diluted with toluene and concentrated by rotary evaporation. The residue was allowed to stir in MeOH for 30 min and then concentrated again by rotary evaporation. The residue was partitioned between EtOAc and aqueous solution of NaHCO₃ and the aqueous layer further extracted with EtOAc. The combined organic layers were washed with brine dried over sodium sulfate and concentrated by rotary evaporation. The crude material was purified by column chromatography to yield N-(2-amino-5-bromopyridin-3-yl)methanesulfonamide (650 mg, 73%). LCMS (AA): m/z=266/268 (M+H).

Step 2: N-(2-amino-5-bromopyridin-3-yl)-N-methylmethanesulfonamide

To a mixture of N-(2-amino-5-bromopyridin-3-yl)methanesulfonamide (205 mg, 0.770 mmol) and potassium carbonate (165 mg, 1.19 mmol) in acetone (2.5 mL, 34 mmol) was added methyl iodide (59 uL, 0.95 mmol). The mixture was allowed to stir at rt overnight and then partitioned between EtOAc and water. The aqueous layer was further extracted with EtOAc. The combined organic layers were washed with brine dried over sodium sulfate and concentrated by rotary evaporation. The crude material was purified by column chromatography to yield N-(2-amino-5-bromopyridin-3-yl)-N-methylmethanesulfonamide (94 mg, 44%). LCMS (AA): m/z=280/282 (M+H).

Step 3: N-{6-amino-5-[methyl(methylsulfonyl)amino]-3,4′-bipyridin-2′-yl}acetamide

Followed the procedure described in Step 2 of Example 5 with the following modification: Used 2.0 equivalents of 2 M K₂CO₃ instead of solid potassium carbonate. No additional water was added. The reaction yielded N-{6-amino-5-[methyl(methylsulfonyl)amino]-3,4′-bipyridin-2′-yl}acetamide (11 mg, 10.1%). LCMS (AA): m/z=336.5 (M+H).

The compounds listed in the table below (Table 13) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 13 Compound Example Reagent ag No. LCMS Data 12A

I-181 LCMS (AA): m/z = 348.3 (M + H) 12B

I-64 LCMS (FA): m/z = 420.3 (M − H)

Example 13: N-{6-(methylamino)-5-[methyl(methylsulfonyl)amino]-3,4′-bipyridin-2′-yl}acetamide I-147

Step 1: N-[5-bromo-2-(methylamino)pyridin-3-yl]-N-methylmethanesulfonamide

To a mixture of N-(2-amino-5-bromopyridin-3-yl)-N-methylmethanesulfonamide (101 mg, 0.360 mmol) in DMF (1.2 mL) at 5° C. was added NaH (60% in mineral oil, 18.0 mg, 0.451 mmol). The mixture was allowed to stir at 5° C. for 20 min. Methyl iodide (28.0 uL, 0.451 mmol) was added and the mixture was allowed to stir at 5° C. for 1 h. The reaction was quenched with a saturated solution of NaHCO₃ and then partitioned between EtOAc and water. The aqueous layer was further extracted with EtOAc. The combined organic layers were washed with brine dried over sodium sulfate and concentrated by rotary evaporation. The crude material was purified by column chromatography to yield N-[5-bromo-2-(methylamino)pyridin-3-yl]-N-methylmethanesulfonamide (85 mg, 80.0%). LCMS (AA): m/z=294/296 (M+H).

Step 2: N-{6-(methylamino)-5-[methyl(methylsulfonyl)amino]-3,4′-bipyridin-2′-yl}acetamide

Followed the procedure described in Step 2 of Example 5 with the following modification: 2.0 equivalents of 2M K₂CO₃ was used instead of solid potassium carbonate. No additional water was added. The reaction yielded N-{6-(methylamino)-5-[methyl(methylsulfonyl)amino]-3,4′-bipyridin-2′-yl}acetamide (82 mg, 82.2%). LCMS (AA): m/z=350.2 (M+H).

The compounds listed in the table below (Table 14) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 14 Compound Example Reagent an No. LCMS Data 13A

I-132 LCMS (AA): m/z = 362.3 (M + H) 13B

I-141 LCMS (FA): m/z = 390.5 (M + H)

Example 14: N-{4-[5-(methylsulfonyl)-1-oxidopyridin-3-yl]pyridin-2-yl}acetamide I-191

Step 1: 3-bromo-5-(methylsulfonyl)pyridine 1-oxide

A solution of 3-bromo-5-(methylsulfonyl)pyridine 1-oxide (250 mg, 1.06 mmol) was dissolved in DCM (1.8 mL) and cooled to 0° C. mCPBA (822 mg, 4.77 mmol) was added portionwise, and then allowed to warm to rt and stir overnight. The reaction mixture was concentrated and a 15% K₂CO₃ solution was added and extracted with EtOAc. The combined organic layers were washed with brine, dried over MgSO₄ and concentrated by rotary evaporation. The crude compound was used without further purification.

Step 2: N-{4-[5-(methylsulfonyl)-1-oxidopyridin-3-yl]pyridin-2-yl}acetamide

3-bromo-5-(methylsulfonyl)pyridine 1-oxide (240 mg, 0.19 mmol), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (75 mg, 0.29 mmol), K₂CO₃ (132 mg, 0.95 mmol) and SiliaCat DPP-Pd (91 mg, 0.022 mmol) were suspended in dioxane (3.0 mL) and water (0.43 mL). The reaction mixture was heated at 150° C. in the microwave for 40 min. The solvent was removed by rotary evaporation, then the crude compound was purified by column chromatography followed by prep HPLC to give N-{4-[5-(methylsulfonyl)-1-oxidopyridin-3-yl]pyridin-2-yl}acetamide (10 mg, 17%). LCMS (FA): m/z=308.1 (M+H).

The compounds listed in the table below (Table 15) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 15 Compound Example Reagent aq No. LCMS Data 14A

I-129 LCMS (FA): m/z = 351.3 (M + H)

Example 15: N-[5-(cyclopropylcarbonyl)-3,4′-bipyridin-2′-yl]acetamide I-8

Step 1: 5-Bromo-N-methoxy-N-methylpyridine-3-carboxamide

To a suspension of 5-bromonicotinic acid (1.12 g, 5.54 mmol) in DCM (106 mL) at 0° C. were added NMP (0.588 mL, 6.10 mmol), N,O-dimethylhydroxylamine hydrochloride (0.595 g, 6.10 mmol) and EDC (1.17 g, 6.10 mmol). The reaction was warmed to rt and allowed to stir overnight. The reaction mixture was diluted with DCM and water. The organic layer was washed with 0.1 M HCl and brine, dried over magnesium sulfate, filtered and concentrated. The crude material was purified by column chromatography to yield 5-bromo-N-methoxy-N-methylpyridine-3-carboxamide (1.39 g, 51.1%). LCMS (FA): m/z=245/247 (M+H).

Step 2: (5-bromopyridin-3-yl)(cyclopropyl)methanone

5-Bromo-N-methoxy-N-methylpyridine-3-carboxamide (500 mg, 1.02 mmol) was allowed to stir in THF (4.8 mL) and cooled to 0° C. Cyclopropylmagnesium bromide (0.5 M in THF; 10.0 mL, 5.02 mmol) was added dropwise and the reaction mixture allowed to stir at 0° C. for 30 min and then allowed to warm to rt. The reaction mixture was then cooled in an ice/water bath and quenched with acid and then diluted with DCM. The organic layer was washed with brine, dried over magnesium sulfate, filtered and concentrated. The crude material was purified by column chromatography to yield (5-bromopyridin-3-yl)(cyclopropyl)methanone (218 mg, 56.8%). LCMS (FA): m/z=226/228 (M+H).

Step 3: N-[5-(1,1-dioxidoisothiazolidin-2-yl)-3,4′-bipyridin-2′-yl]acetamide

Followed the procedure described in Step 2 of Example 14 to yield N-[5-(cyclopropylcarbonyl)-3,4′-bipyridin-2′-yl]acetamide (15.7 mg, 21.0%). LCMS (FA): m/z=282.3 (M+H).

Example 16: methyl (5-{[(2,4-difluorophenyl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′-yl)carbamate I-195

Step 1: (5-{[(2,4-difluorophenyl)sulfonyl]amino}-6-methylpyridin-3-yl)boronic acid

The boronate was prepared in a similar manner as N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide in Example 1 and used without further purification. LCMS (FA) m/z=329.4 (M+H).

Step 2: methyl (5-{[(2,4-difluorophenyl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′-yl)carbamate

Followed the procedure described in Step 2 of Example 5 to yield methyl (5-{[(2,4-difluorophenyl)sulfonyl]amino}-6-methyl-3,4′-bipyridin-2′-yl)carbamate (16 mg, 30%). LCMS (FA): m/z=435.2 (M+H).

The compounds listed in the table below (Table 16) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 16 Starting material* Compound Example Reagent Chemical Structure No. LCMS Data 16A* ax

I-146 LCMS (FA): m/z = 363.3 (M + H) 16B ax

I-56 LCMS (AA): m/z = 417.1 (M + H) az

16C az

I-180 LCMS (FA) m/z = 298.2 (M + H) *The starting material for example 16A was prepared according to Example 11, steps 1 and 2.

Example 17: N-{6-amino-5-[(cyclopropylmethyl)amino]-3,4′-bipyridin-2′-yl}acetamide I-35

Step 1: 5-bromo-N2-(cyclopropylmethyl)pyridine-2,3-diamine; 5-bromo-N,N′-bis(cyclopropylmethyl)pyridine-2,3-diamine; 5-bromo-N3-(cyclopropylmethyl)pyridine-2,3-diamine

To a flask containing 2,3-diamino-5-bromopyridine (2.20 g, 11.7 mmol) in DCM (70 mL, 1000 mmol) was added 10 drops of acetic acid and cyclopropanecarboxaldehyde (0.874 mL, 11.7 mmol). A small amount of DMF was added to solubilize the reaction mixture. The mixture was allowed to stir for 30 min followed by the addition of STAB (7.44 g, 35.1 mmol). The reaction was allowed to stir at rt overnight. An aqueous solution of sodium carbonate was added dropwise until gas evolution ceased. The residue was partitioned between DCM and water and the organic layer was dried over sodium sulfate, filtered and concentrated by rotary evaporation. The crude material was purified by column chromatography to yield 5-bromo-N-2-(cyclopropylmethyl)pyridine-2,3-diamine (355 mg, 12.5%) LCMS (FA): m/z=242/244 (M+H), 5-bromo-N-3-(cyclopropylmethyl)pyridine-2,3-diamine (763 mg, 26.9%) LCMS (FA): m/z=242/244 (M+H), and 5-bromo-N,N-bis(cyclopropylmethyl)pyridine-2,3-diamine (596 mg, 17.2%). LCMS (FA): m/z=270/272 (M+H).

Step 2: N-{6-amino-5-[(cyclopropylmethyl)amino]-3,4′-bipyridin-2′-yl}acetamide

The procedure from Example 5, Step 2 was followed to provide N-{6-amino-5-[(cyclopropylmethyl)amino]-3,4′-bipyridin-2′-yl}acetamide (90 mg, 26%) LCMS (FA): m/z=298.2 (M+H).

The compounds listed in the table below (Table 17) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 17 Ex- Starting material* Com- am- Rea- pound ple gent Chemical Structure No. LCMS Data 17A bc″

I-53 LCMS (FA): m/z = 298.2 (M + H) 17B bc″′

I-65 LCMS (AA): m/z = 352.4 (M + H) *Synthesized according to Step 1 of Example 17.

Example 18: N-{4-[1-(cyclopropylmethyl)-2,2-dioxido-1,3-dihydro[1,2,5]thiadiazolo[3,4-b]pyridin-6-yl]pyridin-2-yl}acetamide I-29

A mixture of N-{6-amino-5-[(cyclopropylmethyl)amino]-3,4′-bipyridin-2′-yl}acetamide (0.100 g, 0.336 mmol) and sulfamide (0.048 g, 0.504 mmol) in pyridine (0.71 mL, 8.8 mmol) was heated at reflux overnight. The reaction was cooled to rt and the pyridine removed by rotary evaporation. DMF was added and the mixture was filtered through celite. The supernatant was concentrated and purified by prep HPLC to yield N-{4-[1-(cyclopropylmethyl)-2,2-dioxido-1,3-dihydro[1,2,5]thiadiazolo[3,4-b]pyridin-6-yl]pyridin-2-yl}acetamide (76 mg, 62.9%). LCMS (FA): m/z=360.2 (M+H).

The compounds listed in the table below (Table 18) were prepared in an analogous fashion to that described above starting from the appropriate starting materials (i.e., I-53):

TABLE 18 Compound Example Starting material No. LCMS Data 18A

I-68 LCMS (FA): m/z = 360.2 (M + H)

Example 19: N-{5-[(1E)-3-(4-fluorophenyl)-3-oxoprop-1-en-1-yl]-3,4′-bipyridin-2′-yl}acetamide I-188

Step 1: (2E)-3-(5-bromopyridin-3-yl)-1-(4-fluorophenyl)prop-2-en-1-one

To a solution of 4′-fluoroacetophenone (0.302 mL, 2.49 mmol), 5-bromo-3-formylpyridine (0.500 g, 2.69 mmol) in water (7.5 mL) and MeOH (7.5 mL, 184 mmol) was added a solution of sodium hydroxide (0.075 g, 1.9 mmol) in water (0.747 mL, 41.4 mmol). A precipitate was observed within 2 min. After 2 h, the precipitate was filtered and collected to yield (2E)-3-(5-bromopyridin-3-yl)-1-(4-fluorophenyl)prop-2-en-1-one (67.4 mg, 88.4%). LCMS (AA): m/z=307.9 (M+H).

Step 2: N-{5-[(1E)-3-(4-fluorophenyl)-3-oxoprop-1-en-1-yl]-3,4′-bipyridin-2′-yl}acetamide

The procedure described in Step 2 of Example 5 was followed with the following modification: The reaction was heated in the microwave at 120° C. for 30 min to yield N-{5-[(1E)-3-(4-fluorophenyl)-3-oxoprop-1-en-1-yl]-3,4′-bipyridin-2′-yl}acetamide (30 mg, 15.2%). LCMS (FA): m/z=362 (M+H).

The compound listed in the table below (Table 19) was prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 19 Compound LCMS Example Reagent Starting material No. Data 19A bf

I-198 LCMS (AA): m/z = 362.2 (M + H) bg

Example 20: 2′-acetamido-6-amino-N,N-dimethyl-3,4′-bipyridine-5-carboxamide I-149

Step 1: 2-amino-5-bromo-N,N-dimethylnicotinamide

2-Amino-5-bromonicotinic acid (390 mg, 1.8 mmol) and DIEA (2.38 mL, 13.7 mmol) were allowed to stir in DCM (46.5 mL). TBTU (1.44 g, 4.49 mmol) was added and the reaction was allowed to stir at rt for 15 min. Dimethylamine (2 M in THF; 7.19 mL, 14.4 mmol) was added and the reaction was allowed to stir at rt overnight. The reaction mixture was diluted with water and extracted with DCM. The combined organic layers were washed with brine, dried over sodium sulfate and concentrated. The crude material residue was purified by column chromatography to yield 2-amino-5-bromo-N,N-dimethylnicotinamide (350 mg, 79.8%). LCMS (FA): m/z=244/246 (M+H).

Step 2: 2′-acetamido-6-amino-N,N-dimethyl-3,4′-bipyridine-5-carboxamide

A microwave tube was charged with N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (153 mg, 0.582 mmol), 2-amino-5-bromo-N,N-dimethylnicotinamide (115 mg, 0.471 mmol) and Pd(dppf)Cl₂ (24 mg, 0.030 mmol). 1,4-dioxane (3.7 mL, 47 mmol) and potassium carbonate (2 M in water; 0.471 mL, 0.942 mmol) were added. The tube was purged with nitrogen and heated at 130° C. for 30 min in the microwave. The mixture was partitioned between EtOAc and water. The aqueous layer was further extracted with EtOAc and the combined organic layers were washed with brine, dried over sodium sulfate and concentrated. The crude material was purified by prep HPLC to yield 2′-acetamido-6-amino-N,N-dimethyl-3,4′-bipyridine-5-carboxamide (75 mg, 53.2%). LCMS (AA): m/z=300.1 (M+H).

The compounds listed in the table below (Table 20) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 20 Starting material Compound Example Reagent Chemical Structure No. LCMS Data 20A bk

I-200 LCMS (FA): m/z = 312.4 (M + H) 20B bk

I-27 LCMS (AA): m/z = 328.5 (M + H) 20C bk

I-81 LCMS (FA): m/z = 354.5 (M + H) 20D bk

I-125 LCMS (FA): m/z = 374.4 (M + H) 20E bk

I-10 LCMS (FA): m/z = 340.4 (M + H) 20F bk

I-15 LCMS (FA): m/z = 326.4 (M + H) 20G bk

I-187 LCMS (FA): m/z = 338.4 (M + H) 20H bk

I-91 LCMS (FA): m/z = 349.2 (M + H) 20I bk —H₂N I-57 LCMS (AA): m/z = 286.3 (M + H) 20J bk

I-79 LCMS (AA): m/z = 355.4 (M + H) 20K bk

I-14 LCMS (FA): m/z = 326.3 (M + H) 20L bk

I-169 LCMS (FA): m/z = 312.4 (M + H) 20M bk

I-121 LCMS (FA): m/z = 364.4 (M + H) 20N bk

I-82 LCMS (FA): m/z = 366.4 (M + H) 20O bk

I-71 LCMS (FA): m/z = 374.4 (M + H) 20P bk

I-136 LCMS (FA): m/z = 382.4 (M + H) 20Q bk

I-60 LCMS (FA): m/z = 362.4 (M + H) 20R bk

I-210 LCMS (FA): m/z = 356.4 (M + H) 20S bk

I-152 LCMS (FA): m/z = 342.4 (M + H) 20T bk

I-157 LCMS (FA): m/z = 344.4 (M + H) 20U bk

I-179 LCMS (FA): m/z = 384.3 (M + H) 20V bj

I-22 LCMS (AA): m/z = 314.4 (M + H) bk

20W bj

I-162 LCMS (FA): m/z = 328.3 (M + H) bk

20X bj

I-127 LCMS (FA): m/z = 315.4 (M + H) bk

20Y bj

I-213 LCMS (FA): m/z = 319.4 (M + H) bk

20Z bj

I-75 LCMS (FA): m/z = 299.3 (M + H) bk

20AA bj

I-48 LCMS (AA): m/z = 285.3 (M + H) bk

20AB bj

I-160 LCMS (FA): m/z = 352.4 (M + H) bk

20AC bl

I-303 LCMS (FA): m/z = 388.3 (M + H) bm

20AD bl

I-315 LCMS (FA): m/z = 375.2 (M + H) bm*

20AE bl

I-232 LCMS (FA): m/z = 381.0 (M + H) bm*

20AF** bk

I-216 LCMS (AA): m/z = 350.1 (M + H) bm

20AG bk

I-298 LCMS (FA): m/z = 374.3 (M + H) bm

20AH bl

I-280 LCMS (FA): m/z = 321.2 (M + H) bm*

20AI bl

I-302 LCMS (FA): m/z = 377.0 (M + H) bm*

20AJ bl

I-262 LCMS (FA): m/z = 389.2 (M + H) bm*

20AK{circumflex over ( )}{circumflex over ( )} bj

I-485 LCMS (FA): m/z = 397.2 (M + H) bk***

bl

bl′{circumflex over ( )}

20AL{circumflex over ( )}{circumflex over ( )} bj

I-388 LCMS (FA): m/z = 377.2 (M + H) bk

bl

bl′{circumflex over ( )}

bm

20AM bj

I-423 LCMS (FA): m/z = 413.2 (M + H) bk***

bl{circumflex over ( )}

20AN bj

I-431 LCMS (FA): m/z = 383.2 (M + H) bk***

bl{circumflex over ( )}

20AO** bj

I-409 LCMS (FA): m/z = 314.1 (M + H) bk

bl

20AP bj

I-434 LCMS (FA): m/z = 345.0 (M + H) bk

bl*

bm

20AQ{circumflex over ( )}{circumflex over ( )} bj

I-346 LCMS (FA): m/z = 447.1 (M + H) bk

bl

bl′

bm*

20AR bj

I-495 LCMS (FA): m/z = 389.2 (M + H) bk

bl

bm*

20AS bj

I-408 LCMS (FA): m/z = 383.1 (M + H) bk

bl

bm*

20AT bj

I-415 LCMS (FA): m/z = 403.1 (M + H) bk

bl

bm*

20AU bj

I-413 LCMS (FA): m/z = 409.2 (M + H) bk

bl

bm*

*Step 2 conditions use SiliaCat DPP-Pd instead of Pd(dppf)Cl₂ and microwave irradiation **Deprotection of the BOC group according to Example 20AF (see below) employed to generate I-216 and I-XXX ***In Step 1, HATU, DIEA, and DMF were used with microwave irradiation (120° C.) {circumflex over ( )}Step 2 conditions use Pd(PPh₃)₄, 1.0M Na₂CO₃; toluene, and EtOH under microwave irradiation {circumflex over ( )}{circumflex over ( )}Synthesis of reagent bl′ shown in Table 20a.

Example 20AF: 6-Amino-N-carbamimidoyl-2′-(pyrimidin-4-ylamino)-3,4′-bipyridine-5-carboxamide I-216

To a solution of crude tert-butyl (N-{[6-amino-2′-(pyrimidin-4-ylamino)-3,4′-bipyridin-5-yl]carbonyl}carbamimidoyl)carbamate (300 mg, 327.4 mmol) in DCM (5 mL) was added TFA (5 mL) at rt. The reaction mixture was allowed to stir for 12 h at rt. The reaction mixture was then concentrated. The crude compound was purified by column chromatography to provide 6-amino-N-carbamimidoyl-2′-(pyrimidin-4-ylamino)-3,4′-bipyridine-5-carboxamide I-216 (58 mg, 30%). LCMS (FA): m/z=350.1 (M+H).

Synthesis of reagents bl′ for Examples 20AK, 20AL and 20AX: 5-bromo-N-(2,4-difluorophenyl)-N,2-dimethylnicotinamide

A mixture of 5-bromo-N-(2,4-difluorophenyl)-2-methylnicotinamide (0.110 g, 0.336 mmol) and K₂CO₃ (0.140 g, 1.01 mmol) were placed in a microwave vial and sealed. The reaction vessel was evacuated with argon, and acetone (6.0 mL) was added. The vessel was again evacuated with argon, methyl iodide (0.10 mL, 1.68 mmol) was added, and the reaction was subjected to microwave irradiation at 120° C. for 20 min. The crude reaction material was mixed with 1 g of silica and the solvent was removed. The residue was purified by column chromatography to give 5-bromo-N-(2,4-difluorophenyl)-N,2-dimethylnicotinamide (51.8 mg, 45.2%). LCMS (FA): m/z=342.1 (M+H).

TABLE 20a Starting Material LCMS Data for Reagent bl′ Reagent Reagent bl structure bl′ Intermediate

bl

LCMS (FA): m/z = 342.1 (M + H) From Examples 20AK (I-485) and 20AQ (I-346)

bl

LCMS (FA): m/z = 297.0 (M + H) From example 20BB

Example 21: N-(2′-acetamido-3,4′-bipyridin-5-yl)benzamide I-13

Step 1: N-(5-bromopyridin-3-yl)benzamide

3-Amino-5-bromopyridine (0.589 g, 3.40 mmol), DCM (33.1 mL), DIEA (1.18 mL, 6.81 mmol), and benzoyl chloride (0.593 mL, 5.11 mmol) were combined and allowed to stir at rt overnight. The reaction mixture was concentrated by rotary evaporation and diluted with EtOAc and 1 N NaOH (aq). The organic layer was washed with water and brine, dried over sodium sulfate and concentrated by rotary evaporation. The crude material was purified by column chromatography to yield N-(5-bromopyridin-3-yl)benzamide (0.679 g, 72.0%). LCMS (AA): m/z=277/279 (M+H).

Step 2: N-(2′-acetamido-3,4′-bipyridin-5-yl)benzamide

To a reaction vial were added N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (0.142 g, 0.544 mmol)), N-(5-bromopyridin-3-yl)benzamide (0.196 g, 0.707 mmol), potassium carbonate (150 mg, 1.09 mmol) and dioxane-water (6:1 mixture of 1,4-dioxane:water; 4.80 mL). The mixture was flushed with argon and Pd(dppf)Cl₂ (22.4 mg, 0.027 mmol) was added. The reaction was sealed and heated at 120° C. in an oil bath for 18 h. The reaction was filtered through celite and the celite was washed with DCM. The filtrate was concentrated and the residue was purified by column chromatography to yield N-(2′-acetamido-3,4′-bipyridin-5-yl)benzamide (60 mg, 33.3%). LCMS (FA): m/z=333.1 (M+H).

The compounds listed in the table below (Table 21) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 21 Ex- Starting material Com- am- Rea- pound LCMS ple gent Chemical Structure No. Data 21A* bo

I-106 LCMS (FA): m/z = 347.1 21B bn

I-115 LCMS (FA): m/z = 383.4 bo

21C bn

I-193 LCMS (AA): m/z = 285.5 bo

21D{circumflex over ( )} bo{circumflex over ( )}{circumflex over ( )}

I-419 LCMS (FA): m/z = 369.1 21E{circumflex over ( )} bn

I-347 LCMS (FA): m/z = 399.5 bo{circumflex over ( )}{circumflex over ( )}

21F bn

I-450 LCMS (FA): m/z = 360.2 bo

bp

bq***

21G bn

I-371 LCMS (FA): m/z = 386.4 bo

bp

bq{circumflex over ( )}{circumflex over ( )}{circumflex over ( )}

*In Step 1, TEA was used instead of DIEA. The reaction was heated at 50° C. overnight instead of at rt. **In Step 1, HATU, DIEA, and DMF were used with microwave irradiation (120° C.) ***In Step 2, XPhosG3 was used with K₃PO₄ in 1,4-dioxane; microwave irradiation (130° C.) {circumflex over ( )}Step 2 conditions use Pd(PPh₃)₄, 1.0M Na₂CO₃; toluene, and EtOH under microwave irradiation {circumflex over ( )}{circumflex over ( )}Step 1 conditions use pyridine instead of DIEA {circumflex over ( )}{circumflex over ( )}{circumflex over ( )}Step 2 conditions use microwave irradiation (150° C.)

Example 22: 2′-Acetamido-N-(2,4-difluorophenyl)-6-(dimethylamino)-N-methyl-[3,4′-bipyridine]-5-carboxamide I-174

Step 1: 5-bromo-2-(dimethylamino)nicotinic acid

5-Bromo-2-fluoronicotinic acid (450 mg, 2.0 mmol) and DIEA (2.71 mL, 15.6 mmol) were dissolved in THF (67.0 mL). The reaction mixture was allowed to stir at rt for 15 min. Then, dimethylamine (2.0 M in THF, 8.18 mL, 16.4 mmol) was added and the reaction was allowed to stir at rt for 3 h. The reaction was concentrated to dryness and used in the next step without purification. LCMS (FA): m/z=245.1/247.2 (M+H).

Step 2: 5-bromo-N-(2,4-difluorophenyl)-2-(dimethylamino)-N-methylnicotinamide

To a solution of 5-bromo-2-(dimethylamino)nicotinic acid (192 mg, 0.783 mmol) in thionyl chloride (10 mL) was added DMF (0.5 mL). The reaction mixture was allowed to stir at reflux for 2 h. Then, the mixture was evaporated to dryness and used without purification. To the mixture, N-1-methyl-2,4-difluoroaniline (168 mg, 1.18 mmol), DMAP (19.1 mg, 0.157 mmol), pyridine (317 uL, 3.92 mmol) and DCE (25.6 mL) were added. The reaction mixture was allowed to stir at 70° C. for 3 h. The reaction mixture was then quenched with water and then diluted with DCM. The organic layer was washed with brine, dried over magnesium sulfate, filtered and concentrated. The crude material was purified by column chromatography to yield 5-bromo-N-(2,4-difluorophenyl)-2-(dimethylamino)-N-methylnicotinamide (157 mg, 54.1%). LCMS (FA): m/z=370.3/372.3 (M+H).

Step 3: 2′-Acetamido-N-(2,4-difluorophenyl)-6-(dimethylamino)-N-methyl-[3,4′-bipyridine]-5-carboxamide

To a solution of N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (164 mg, 0.628 mmol) in 1,4-dioxane (6.3 mL) and water (0.2 mL, 9 mmol) were added 5-bromo-N-(2,4-difluorophenyl)-2-(dimethylamino)-N-methylnicotinamide (155 mg, 0.418 mmol), tetrakis (triphenylphosphine) palladium (32.0 mg, 0.026 mmol) and cesium carbonate (409 mg, 1.26 mmol). The reaction mixture was heated at 140° C. for 30 min under microwave irradiation. Then, the reaction mixture was diluted with EtOAc. The organic layer was washed with brine, dried over magnesium sulfate, filtered and concentrated. The crude material was purified by prep HPLC to yield 2′-acetamido-N-(2,4-difluorophenyl)-6-(dimethylamino)-N-methyl-[3,4′-bipyridine]-5-carboxamide (91 mg, 51.0%). LCMS (FA): m/z=426.5 (M+H).

The compound listed in the table below (Table 22) were prepared in an analogous fashion to that described above starting from the appropriate starting materials:

TABLE 22. Compound Example Reagent bu No. LCMS Data 22A

I-112 LCMS (FA): m/z = 412.5 (M + H)

Example 22B: 2′-Acetamido-N-(bicyclo[1.1.1]pent-1-yl)-6-(dimethylamino)-3,4′-bipyridine-5-carboxamide (I-283)

Step 1: N-(Bicyclo[1.1.1]pent-1-yl)-5-bromo-2-(dimethylamino)nicotinamide

To a solution of 5-bromo-2-(dimethylamino)nicotinic acid (0.20 g, 0.82 mmol) in DCM (8 mL) and DIEA (0.21 mL, 1.22 mmol) were added TBTU (0.76 g, 2.37 mmol) and bicyclo[1.1.1]pentan-1-amine hydrochloride salt (117 mg, 0.98 mmol). The reaction mixture was allowed to stir at rt overnight. The reaction mixture was partitioned into water and DCM. The organic solutions were separated, washed with brine, dried over MgSO₄, filtered and concentrated. The residue was purified by column chromatography to give N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-(dimethylamino)nicotinamide (0.20 g, 77%). LCMS (FA): m/z=310.3/312.3 (M+H).

Step 2: 2′-Acetamido-N-(bicyclo[1.1.1]pent-1-yl)-6-(dimethylamino)-3,4′-bipyridine-5-carboxamide

To a vial were added N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (198 mg, 0.75 mmol) and N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-(dimethylamino)nicotinamide (0.195 g, 0.629 mmol), Pd(dppf)Cl₂, complex with DCM (1:1) (32 mg, 0.039 mmol), 2.0 M potassium carbonate in water (0.63 mL) and 1,4-dioxane (4.9 mL). The vial was thoroughly flushed with N₂ and then subjected to microwave irradiation at 130° C. for 30 min. The reaction mixture was partitioned into EtOAc and water. The aqueous solutions were extracted twice. The organic solutions were combined, washed with brine, dried over MgSO₄, filtered and concentrated. The residue was purified by column chromatography to give 2′-acetamido-N-(bicyclo[1.1.1]pent-1-yl)-6-(dimethylamino)-3,4′-bipyridine-5-carboxamide I-283 (0.20 g, 80%) LCMS (FA): m/z=366.2 (M+1).

Example 22C: N-(bicyclo[1.1.1]pent-1-yl)-6-(dimethylamino)-N-methyl-2′-((2-methylpyrimidin-4-yl)amino)-3,4′-bipyridine-5-carboxamide (I-306)

Step 1: N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-fluoronicotinamide

To 5-bromo-2-fluoronicotinic acid (1.00 g, 4.55 mmol) in DCM (43 mL) were added DIEA (1.19 mL, 6.82 mmol), TBTU (4.23 g, 13.2 mmol) and bicyclo[1.1.1]pentan-1-amine hydrochloride salt (652 mg, 5.45 mmol). The reaction mixture was allowed to stir at rt overnight. The reaction mixture was diluted with DCM and water. The aqueous solution was extracted twice. The organic solutions were combined, washed with brine, dried over MgSO₄, filtered and concentrated under reduced pressure. The residue was purified by column chromatography to give N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-fluoronicotinamide as a white solid (0.80 g, 62%). LCMS (FA): m/z=285.0/287.0 (M+H).

Step 2: N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-fluoro-N-methylnicotinamide

N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-fluoronicotinamide (500 mg, 1.75 mmol) was dissolved in THF (15 mL). The reaction mixture was cooled to 0° C. and sodium hydride (60% dispersion in mineral oil, 175 mg, 4.38 mmol) was added. To the reaction mixture, a solution of methyl iodide (0.33 mL, 5.27 mmol) in THF (0.1 mL) was added slowly. The reaction mixture was allowed to stir for 4 h. The reaction mixture was concentrated under reduced pressure and the residue was diluted with 1N HCl and extracted with Et₂O. The organic solutions were separated, washed with brine, dried over MgSO₄, filtered and concentrated under reduced pressure. The residue was purified by column chromatography to give N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-fluoro-N-methylnicotinamide (0.44 g, 83%). LCMS (FA): m/z=299.0 (M+H).

Step 3: N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-(dimethylamino)-N-methylnicotinamide

To N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-fluoro-N-methylnicotinamide (0.15 g, 0.50 mmol) were added THF (6.4 mL) and DIEA (0.26 mL, 1.50 mmol). To this stirred solution, 2.0 M of dimethylamine in THF (1.50 mL, 3.00 mmol) was added. The reaction mixture was allowed to stir overnight and was then concentrated. The residue was purified by column chromatography to give N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-(dimethylamino)-N-methylnicotinamide (0.15 g, 78%). LCMS (FA): m/z=324.1/326.1 (M+H).

Step 4: (5-(bicyclo[1.1.1]pent-1-yl(methyl)carbamoyl)-6-(dimethylamino)pyridin-3-yl)boronic acid

To a flask were added N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-2-(dimethylamino)-N-methylnicotinamide (90 mg, 0.28 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi-1,3,2-dioxaborolane (88 mg, 0.35 mmol), potassium acetate (80 mg, 0.82 mmol), Pd(dppf)Cl₂ (27 mg, 0.033 mmol) and 1,4-dioxane (3.1 mL). The flask was flushed with N₂ and the reaction mixture was allowed to stir at 90° C. overnight. The reaction mixture was filtered through celite. The filter cake was washed with fresh EtOAc. The filtrate was concentrated under reduced pressure to give a viscous dark brown oil which was used in the next step without purification. LCMS (FA): m/z=290.1 (M+H).

Step 5: N-(bicyclo[1.1.1]pent-1-yl)-6-(dimethylamino)-N-methyl-2′-((2-methylpyrimidin-4-yl)amino)-[3,4′-bipyridine]-5-carboxamide

To a vial were added (5-(bicyclo[1.1.1]pent-1-yl(methyl)carbamoyl)-6-(dimethylamino)pyridin-3-yl)boronic acid (65 mg, 0.22 mmol), N-(4-chloropyridin-2-yl)-2-methylpyrimidin-4-amine (59 mg, 0.27 mmol), XPhos (3.3 mg, 0.007 mmol), XPhosG3 (6.4 mg, 0.007 mmol), 0.5 M potassium phosphate in water (0.91 mL, 0.45 mmol) and 1,4-dioxane (0.45 mL). The vial was thoroughly flushed with N₂ and then was subjected to microwave irradiation at 120° C. for 30 min. The reaction mixture was partitioned into EtOAc and water. The aqueous solution was extracted twice. The organic solutions were combined, washed with brine, dried over MgSO₄, filtered and concentrated under reduced pressure. The crude compound was purified by column chromatography to give N-(bicyclo[1.1.1]pent-1-yl)-6-(dimethylamino)-N-methyl-2′-((2-methylpyrimidin-4-yl)amino)-3,4′-bipyridine-5-carboxamide I-306 (0.042 g, 44%) with 90% purity. LCMS (FA): m/z=430.2 (M+H).

The compounds listed in the table below (Table 23) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 23 Ex- Starting Material Compound LCMS ample Reagent Chemical Structure No. Data 22D dq*

I-284 LCMS (FA): m/z = 416.2 (M + H) 22E dq*

I-222 LCMS (FA): m/z = 402.2 (M + H) dn

22F dq*

I-449 LCMS (FA): m/z = 366.2 (M + H) dn

do**

*Step 5 conditions use Pd(dppf)Cl₂ and K₂CO₃ instead of XPhosG3/XPhos and K₃PO₄ **In Step 4, the final product for example 22F is generated from direct reaction of reagent do with reagent dq using Pd(dppf)Cl₂ and K₂CO₃ instead of XPhosG3/XPhos and K₃PO₄

Example 23: N-{4-[1-(cyclopropylsulfonyl)-1H-pyrazolo[4,3-b]pyridin-6-yl]pyridin-2-yl}acetamide and N-{4-[2-(cyclopropylsulfonyl)-2H-pyrazolo[4,3-b]pyridin-6-yl]pyridin-2-yl}acetamide I-2 and I-105

Step 1: 6-bromo-1-(cyclopropylsulfonyl)-1H-pyrazolo[4,3-b]pyridine and 6-bromo-2-(cyclopropylsulfonyl)-2H-pyrazolo[4,3-b]pyridine

To a solution of 6-bromo-1H-pyrazolo[4,3-b]pyridine (145 mg, 0.732 mmol) in THF (4.1 mL) at rt was added NaH (60:40 sodium hydride:mineral oil, 37.0 mg, 0.925 mmol). The mixture was allowed to stir for 5 min and then cooled in ice bath. Cyclopropanesulfonylchloride (95.0 uL, 0.919 mmol) was added dropwise and the mixture was allowed to stir for 2 h while the bath temperature warmed to between 10-15° C. The reaction mixture was quenched with ammonium chloride (2M aq. solution, 5 mL) and was partitioned between EtOAc and water. The aqueous layer was further extracted with EtOAc and the combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated by rotary evaporation. An LCMS of the crude material showed ˜4:1 mixture of isomers. The residue was purified by column chromatography to provide a mixture of 6-bromo-1-(cyclopropylsulfonyl)-1H-pyrazolo[4,3-b]pyridine LCMS (AA): m/z=304.3 (M+H), second peak, and 6-bromo-2-(cyclopropylsulfonyl)-2H-pyrazolo[4,3-b]pyridine LCMS (AA): m/z=304.3 (M+H), first peak (combined yield 201 mg, 90.8%).

Step 2: N-{4-[1-(cyclopropylsulfonyl)-1H-pyrazolo[4,3-b]pyridin-6-yl]pyridin-2-yl}acetamide and N-{4-[2-(cyclopropylsulfonyl)-2H-pyrazolo[4,3-b]pyridin-6-yl]pyridin-2-yl}acetamide

A microwave vial was charged with N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (208 mg, 0.794 mmol), Pd(dppf)Cl₂ (33 mg, 0.040 mmol) and purged with nitrogen. The mixture of 6-bromo-1-(cyclopropylsulfonyl)-1H-pyrazolo[4,3-b]pyridine and 6-bromo-2-(cyclopropylsulfonyl)-2H-pyrazolo[4,3-b]pyridine (194 mg, 0.642 mmol) in 1,4-dioxane (5.0 mL) was added followed by 2 M of potassium carbonate in water (0.642 mL, 1.28 mmol). The reaction mixture was heated in an oil bath at 90° C. for 20 min. The reaction mixture was partitioned between EtOAc and water. The aqueous layer was further extracted with EtOAc and the combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated by rotary evaporation. The crude material was purified by prep HPLC to yield N-{4-[1-(cyclopropylsulfonyl)-1H-pyrazolo[4,3-b]pyridin-6-yl]pyridin-2-yl}acetamide (113 mg, 49.2%). LCMS (AA): m/z=358.1 (M+H) and N-{4-[2-(cyclopropylsulfonyl)-2H-pyrazolo[4,3-b]pyridin-6-yl]pyridin-2-yl}acetamide (21 mg, 9.2%). LCMS (AA): m/z=358.1 (M+H).

Example 24: N-{4-[13-(dimethylsulfamoyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]pyridin-2-yl}acetamide

Step 1: 5-bromo-1H-pyrrolo[2,3-b]pyridine-3-sulfonyl chloride

To a flask containing chlorosulfonic acid (1.00 mL, 15.0 mmol) cooled to 5° C. was added 5-bromo-1H-pyrrolo[2,3-b]pyridine (255 mg, 1.29 mmol) portionwise. The mixture was allowed to warm to rt over the course of 1 h and then heated at 50° C. for 1 h and at 75° C. for 1 h. The reaction was cooled to rt and was quenched by adding the mixture dropwise to 20 mL of ice-water with good stilling. The resulting suspension was allowed to stir for 5 min. and the white solid was collected by filtration and dried under high vacuum to yield 5-bromo-1H-pyrrolo[2,3-b]pyridine-3-sulfonyl chloride (319 mg, 83.4%). LCMS (AA): m/z=293.3 (M+H).

Step 2: 5-bromo-N,N-dimethyl-1H-pyrrolo[2,3-b]pyridine-3-sulfonamide

Dimethylamine (9 M in water, 6 mL, 50 mmol) was added to DCM (6 mL) and allowed to stir for 5 min. The organic layer was removed and dried over anhydrous sodium sulfate and then added to a suspension of 5-bromo-1H-pyrrolo[2,3-b]pyridine-3-sulfonyl chloride (267 mg, 0.903 mmol) in DCM (3.5 mL). The resulting solution was allowed to stir at rt for 2 h. The mixture was partitioned between water and DCM. The aqueous layer was further extracted with DCM and the combined organic layers were dried over sodium sulfate, filtered and concentrated by rotary evaporation to yield 5-bromo-N,N-dimethyl-1H-pyrrolo[2,3-b]pyridine-3-sulfonamide (273 mg, 99.3%). LCMS (AA): m/z=306.3 (M+H).

Step 3: N-{4-[13-(dimethylsulfamoyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]pyridin-2-yl}acetamide

Followed the procedure in Step 2 of Example 23 with the following modification: Heated at 100° C. for 2 h. LCMS (AA): m/z=360.1 (M+H).

The compounds listed in the table below (Table 24) were prepared in an analogous fashion to that described above starting from the list class of starting materials:

TABLE 24 Compound Example Reagent ce No. LCMS Data 24A

I-158 LCMS (FA): m/z = 386.5 (M + H) 24B

I-151 LCMS (FA): m/z = 400.5 (M + H) 24C

I-103 LCMS (FA): m/z = 415.5 (M + H)

Example 25: N-[4-(2-methyl-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-7-yl)pyridin-2-yl]acetamide I-21

Step 1: 7-bromo-2-methyl-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazine 1,1-dioxide

To a suspension of 2-amino-5-bromo-N-methylpyridine-3-sulfonamide (61 mg, 0.23 mmol) and paraformaldehyde (31.0 mg, 0.344 mmol) in isopropyl alcohol (2.7 mL) was added HCl (4 M in 1,4-dioxane, 61 uL, 0.24 mmol). The reaction mixture was allowed to stir at reflux for 2 h, cooled to rt and then placed in the refrigerator overnight. The resulting suspension was filtered and the solid was suspended in water. The pH was adjusted to 7-7.5 with saturated sodium bicarbonate solution. The mixture was allowed to stir for 1 h and filtered. The collected solid was further dried under vacuum to yield 7-bromo-2-methyl-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazine 1,1-dioxide (31 mg, 48.6%). LCMS (AA): m/z=280.2 (M+H).

Step 2: N-[4-(2-methyl-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-7-yl)pyridin-2-yl]acetamide

Followed the procedure in Step 2 of Example 23 to yield N-[4-(2-methyl-1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-e][1,2,4]thiadiazin-7-yl)pyridin-2-yl]acetamide (20 mg, 54%). LCMS (AA): m/z=334.4 (M+H).

Example 26: N-{4-[1-(cyclopropylmethyl)-1H-imidazo[4,5-b]pyridin-6-yl]pyridin-2-yl}acetamide I-135

Step 1: 6-bromo-1-(cyclopropylmethyl)-1H-imidazo[4,5-b]pyridine

To a mixture of 6-bromo-3H-imidazo[4,5-b]pyridine (99 mg, 0.50 mmol) and cesium carbonate (240 mg, 0.75 mmol) in DMF (1.4 mL) was added cyclopropylmethyl bromide (53 uL, 0.55 mmol). The reaction was allowed to stir at rt for 2.5 h and then partitioned between EtOAc and water. The aqueous layer was further extracted with EtOAc and the combined organics were washed with brine, dried over sodium sulfate and concentrated by rotary evaporation. The crude material was purified by column chromatography to yield 6-bromo-1-(cyclopropylmethyl)-1H-imidazo[4,5-b]pyridine (65 mg, 52%). LCMS (AA): m/z=252.2/254.3 (M+H).

Step 2: N-{4-[1-(cyclopropylmethyl)-1H-imidazo[4,5-b]pyridin-6-yl]pyridin-2-yl}acetamide

Followed the procedure in Step 2 of Example 23 with the following modification: Heated at 120° C. for 5 h to yield N-{4-[1-(cyclopropylmethyl)-1H-imidazo[4,5-b]pyridin-6-yl]pyridin-2-yl}acetamide (62 mg, 83%). LCMS (AA): m/z=308.4 (M+H).

Example 27: N-[4-(2-methyl-3H-imidazo[4,5-b]pyridin-6-yl)pyridin-2-yl]acetamide I-66

Step 1: 6-Bromo-2-methyl-3H-imidazo[4,5-b]pyridine

To a flask containing neat 2,3-diamino-5-bromopyridine (2.00 g, 10.6 mmol) was added acetic acid (6.05 mL, 106 mmol) and acetic anhydride (1.76 mL, 18.6 mmol). The resulting dark mixture was heated at 100° C. overnight. The mixture was diluted with EtOH and toluene and then concentrated to dryness. The residue was allowed to stir in 50 mL of EtOAc and 50 mL of saturated sodium bicarbonate for 1 h. The resulting suspension was filtered and the solid was dried under vacuum to provide a light brown solid. The supernatant contained desired product as well and was washed with brine, dried over sodium sulfate and concentrated by rotary evaporation. The light brown solid from the filtration was suspended in EtOAc (20 mL) and heated at reflux for 15 min. After cooling to rt, the solid was filtered and collected. This material and the material recovered from the supernatant in the filtration were purified by column to yield 6-bromo-2-methyl-3H-imidazo[4,5-b]pyridine (732 mg, 32.4%). LCMS (AA): m/z=211.9/213.9 (M+H).

Step 2: N-[4-(2-methyl-3H-imidazo[4,5-b]pyridin-6-yl)pyridin-2-yl]acetamide

Followed the procedure in Step 2 of Example 23 with the following modification: Heated at 120° C. for 15 h to yield N-[4-(2-methyl-3H-imidazo[4,5-b]pyridin-6-yl)pyridin-2-yl]acetamide (13 mg, 14%). LCMS (AA): m/z=268.1 (M+H).

Example 28: Methyl {4-[1-(cyclopropylmethyl)-1H-pyrrolo[3,2-b]pyridin-6-yl]pyridin-2-yl}carbamate I-42

To a flask containing N-{ 4-[1-(cyclopropylmethyl)-1H-pyrrolo[3,2-b)]pyridin-6-yl]pyridin-2-yl}acetamide (I-93 of Example 8L; 179 mg, 0.584 mmol) in DCM (7.5 mL) was added DIEA (0.203 mL, 1.17 mmol). The reaction mixture was cooled to 0° C., methyl chloroformate (0.135 mL, 1.75 mmol) was added slowly and the reaction was stirred for 1 h. Additional methyl chloroformate (0.060 mL) was added and the reaction was stirred for 1 h. Solvent was removed by rotary evaporation followed by the addition of THF (1 mL), MeOH (1 mL) and K₂CO₃ (10 mg). The reaction mixture was allowed to stir for 1.5 h and the solvent was removed by rotary evaporation. The residue was partitioned between EtOAc and water, washed with brine, dried over magnesium sulfate and concentrated by rotary evaporation. The crude material was purified by prep HPLC to yield methyl {4-[1-(cyclopropylmethyl)-1H-pyrrolo[3,2-b]pyridin-6-yl]pyridin-2-yl}carbamate (107 mg, 56.5%). LCMS (FA): m/z=323.0 (M+H).

Example 29: N-{4-[3-(phenylsulfonyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]pyridin-2-yl}acetamide I-176

Step 1: 5-Bromo-3-(phenylsulfanyl)-1H-pyrrolo[2,3-b]pyridine

5-Bromo-1H-pyrrolo[2,3-b]pyridine (360 mg, 1.83 mmol) was dissolved in DMF (13.9 mL) and cooled to 0° C. Sodium hydride (60:40, sodium hydride:mineral oil, 89 mg, 2.23 mmol) was added and the reaction allowed to stir for 15 min followed by the addition of diphenyl disulfide (0.48 g, 2.23 mmol). The reaction mixture was allowed to stir at rt overnight. Water was added and a white solid precipitated out. The solid was filtered and further washed with ether to yield 5-bromo-3-(phenylsulfanyl)-1H-pyrrolo[2,3-b]pyridine (200 mg, 35.9%). LCMS (FA): m/z=306.8 (M+H).

Step 2: 5-Bromo-3-(phenylsulfonyl)-1H-pyrrolo[2,3-b]pyridine

To a solution of 5-bromo-3-(phenylsulfanyl)-1H-pyrrolo[2,3-b]pyridine (200 mg, 0.655 mmol) in DMF (6.0 mL) was added mCPBA (294 mg, 1.31 mmol). The reaction mixture was allowed to stir at rt and an additional 100 mg portion of mCPBA was added 1 h later, then another 100 mg 1 h later. Solid NaHCO₃ and water were added and the desired product precipitated out of solution and collected by filtration to yield 5-bromo-3-(phenylsulfonyl)-1H-pyrrolo[2,3-b]pyridine (220 mg, 100%). LCMS (FA): m/z=338.9 (M+H).

Step 3: N-{4-[3-(phenylsulfonyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]pyridin-2-yl}acetamide

The procedure described in Step 2 of Example 14 was used with the following modification: 1 M K₂CO₃ was used in place of solid K₂CO₃. No additional water was added. The reaction yielded N-{4-[3-(phenylsulfonyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]pyridin-2-yl}acetamide (62%). LCMS (FA): m/z=393.4 (M+H).

Example 30: Methyl [4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-yl]carbamate I-38

Step 1: 4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-amine

A mixture of N-[4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-yl]acetamide (380 mg, 1.50 mol) and sodium hydroxide (300 mg, 7.50 mmol) was allowed to stir in THF (30 mL), MeOH (30 mL) and water (30 mL) for 1 day at rt. Solvent was removed by rotary evaporation. The crude residue was diluted with EtOAc and MeOH and then washed with water and brine. The organic layer was dried over sodium sulfate, filtered and concentrated by rotary evaporation to yield 4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-amine (123 mg, 38.8%). LCMS (FA): m/z=212.1 (M+H).

Step 2: Methyl [4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-yl]carbamate

4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-amine (73 mg, 0.35 mmol) was suspended in DCM (5.0 mL). DIEA (0.12 mL, 0.69 mmol) was added and the mixture was cooled to 0° C. followed by the addition of methyl chloroformate (0.040 mL, 0.52 mmol). The reaction mixture was allowed to stir for 1 h and then concentrated by rotary evaporation. MeOH (5.10 mL) and sodium hydroxide (1 M in water, 1.02 mL) were added and the reaction mixture allowed to stir at rt for 1 h. The mixture was partitioned between EtOAc and water. The aqueous layer was further extracted with EtOAc. The combined organic layers were washed with water and brine, dried over sodium sulfate, filtered and concentrated by rotary evaporation. The crude material was purified by prep HPLC to yield methyl [4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-yl]carbamate (13.6 mg, 14.6%). LCMS (FA): m/z=270.1 (M+H).

The compounds listed in the table below (Table 25) were prepared in an analogous fashion to that described above starting from the list class of starting materials:

TABLE 25 Compound Example Reagent cv No. LCMS Data 30A

I-117 LCMS (FA): m/z = 280.1 (M + H)

Example 31: N-[5-methyl-4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-yl]acetamide I-209

The procedure described in Step 2 of Example 14 was used with the following modification: 1 M K₂CO₃ was used in place of solid K₂CO₃. No additional water was added. The reaction yielded N-[5-methyl-4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-yl]acetamide (26 mg, 19.3%). LCMS (FA): m/z=268.1 (M+H).

Example 32: N-{4-[3-(pyrrolidin-1-ylmethyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]pyridin-2-yl}acetamide I-54

Step 1: 4-(2-chloro-5-fluoropyridin-4-yl)-1-(cyclopropylsulfonyl)-1H-pyrrolo[2,3-c]pyridine

To a mixture of 5-bromo-1H-pyrrolo[2,3-b]pyridine (415 mg, 2.11 mmol), paraformaldehyde (70.8 mg, 2.36 mmol) in 1-butanol (8 mL, 90 mmol) was added pyrrolidine (0.19 mL, 2.3 mmol). The reaction was allowed to stir at 125° C. for 3 h and then concentrated by rotary evaporation. The crude residue was triturated with Et₂O. A solid precipitated out and was isolated by filtration to yield 5-bromo-3-(pyrrolidin-1-ylmethyl)-1H-pyrrolo[2,3-b]pyridine (270 mg, 45.8%). LCMS (FA): m/z=280.2/282.2 (M+H).

Step 2: N-{4-[3-(pyrrolidin-1-ylmethyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]pyridin-2-yl}acetamide

The procedure described in Step 2 of Example 14 was used with the following modification: 1 M K₂CO₃ was used in place of solid K₂CO₃. No additional water was added. The reaction yielded N-{4-[3-(pyrrolidin-1-ylmethyl)-1H-pyrrolo[2,3-b]pyridin-5-yl]pyridin-2-yl}acetamide (65 mg, 57.5%). LCMS (FA): m/z=336.4 (M+H).

The compounds listed in the table below (Table 26) were prepared in an analogous fashion to that described above starting from the list class of starting materials:

TABLE 26 Starting material Compound LCMS Example Reagent Chemical Structure No. Data 32A cy

I-85 LCMS (FA): m/z = 310.5 (M + H) cz

Example 33: N-[4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-yl]acetamide I-189

A mixture of 5-bromo-1H-pyrazolo[3,4-b]pyridine (0.100 g, 0.505 mmol), N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)acetamide (0.199 g, 0.758 mmol), amphosdichloropalladium(II) (0.0718 g, 0.101 mmol) and potassium phosphate (0.323 g, 1.52 mmol) was allowed to stir in water (0.27 mL) and DME (4.6 mL) and heated in the microwave at 150° C. for 60 min. The reaction mixture was partitioned between water and EtOAc and the organic layer was washed with brine. The aqueous layer was further extracted with a DCM/MeOH mixture. The combined all organic layers were dried over magnesium sulfate, filtered and concentrated by rotary evaporation. Added MeOH and filtered to remove solids and concentrated the supernatant by rotary evaporation. Purified by prep HPLC to yield N-[4-(1H-pyrazolo[3,4-b]pyridin-5-yl)pyridin-2-yl]acetamide (1.5 mg, 1.2%). LCMS(FA): m/z=254.4 (M+H).

Example 34: N-{6-chloro-4-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}-2,4-difluorobenzenesulfonamide (I-299)

Step 1: N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide

To a solution of 5-bromo-2-chloro-4-methylpyridin-3-amine (12 g, 54 mmol) in THF (360 mL) was added a solution of LiHMDS in THF (1.0 M, 108 mL, 108 mmol) at −5° C. The reaction mixture was allowed to stir at −5° C. for 10 min. To the reaction mixture, 2,4-difluorobenzenesulfonyl chloride (17.3 g, 81 mmol) was then added. The reaction mixture was allowed to stir at rt for 12 h. The reaction mixture was diluted with saturated aqueous NH₄Cl (200 mL) and extracted with EtOAc. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (11.5 g, 53%). ¹H NMR (400 MHz, CDCl₃) δ 8.37 (s, 1H), 7.72 (m, 1H), 7.00 (m, 2H), 6.70 (s, 1H), 2.64 (s, 3H).

Step 2: N-{6-Chloro-4-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}-2,4-difluorobenzenesulfonamide (I-299)

N-(5-Bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (6.40 g, 16.1 mmol), 2-methyl-N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]pyrimidin-4-amine (6.0 g, 19 mmol) and Pd(dppf)Cl₂ (431 mg, 0.524 mmol) were combined in a round bottomed flask equipped with a stirbar. Degassed 1,4-dioxane (125 mL) and degassed potassium carbonate in water (1.0 M, 32.2 mL, 32.2 mmol) were added. The flask was evacuated and refilled with argon three times and then the reaction mixture was allowed to stir overnight at 105° C. under an argon atmosphere. The reaction was allowed to cool to rt then filtered through a flitted funnel The filtrate was concentrated to ˜one-half volume and then was slowly poured into stirring saline solution (750 mL). The resulting mixture was stirred and the pH was adjusted to ˜6.5 via the slow addition of 1N HCl. The precipitate which formed was collected by filtration and air-dried to leave a gray solid. The crude product was purified by column chromatography to provide N-{6-chloro-4-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}-2,4-difluorobenzenesulfonamide I-299 (4.3 g, 53%) as a white powder. LCMS (FA): m/z=503.1 (M+H). ¹H NMR (400 MHz, DMSO-d6) δ ppm 10.66 (br s, 1H), 10.32 (s, 1H), 8.43 (d, J=5.09 Hz, 1H), 8.37 (d, J=5.74 Hz, 1H), 8.26 (s, 1H), 7.71-7.89 (m, 2H), 7.55-7.71 (m, 2H), 7.28 (m, 1H), 7.07 (br d, J=3.76 Hz, 1H), 2.48 (s, 3H), 2.35 (s, 3H).

The compounds listed in the table below (Table 27) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 27 Com- Starting Material pound LCMS Example Reagent Chemical Structure No. Data 34A dr¹

I-259 LCMS (FA): m/z = 517.1 (M + H) 34B du

I-282 LCMS: (FA): m/z = 489.2 (M + H) 34C dr¹

I-278 LCMS (FA): m/z = 493.1 (M + H) du

34D* dt²

I-247 LCMS (FA): m/z = 433.1 (M + H) du

34E* dt²

I-248 LCMS (FA): m/z = 449.1 (M + H) du

34F* dt²

I-260 LCMS (FA): m/z = 364.2 (M + H) du

34G* dt²

I-268 LCMS (FA): m/z = 380.2 (M + H) du

34K dr

I-469 LCMS (FA): m/z = 467.0 (M + H) dt

du**

34L ds

I-381 LCMS (FA): m/z = 434.2 (M + H) dt**

34N ds

I-435 LCMS: (FA): m/z = 460.2 (M + H) dt**

du**

34O dr

I-486 LCMS (FA): m/z = 494.4 (M + H) dt***

34P dr

I-421 LCMS: (FA): m/z = 425.4 (M + H) ds{circumflex over ( )}{circumflex over ( )}

dt***

34R dr

I-427 LCMS: (FA): m/z = 451.4 (M + H) ds{circumflex over ( )}{circumflex over ( )}

dt**

du

¹See synthesis of reagent dr of Example 34A below. ²See synthesis of reagent dt of Example 34D-G below. *In step 2, Cs₂CO₃ was used instead of K₂CO₃ **In step 2, microwave irradiation was used (140-150° C.) {circumflex over ( )}Step 2 conditions use SiliaCat DPP-Pd and microwave irradiation instead of Pd(dppf)Cl₂ {circumflex over ( )}{circumflex over ( )}In step 1, used pyridine at 80° C. ***In Step 2, XPhosG3 was used with K₃PO₄ in 1,4-dioxane; microwave irradiation (130° C.)

Synthesis of reagent (dr) from Example 34A: 5-bromo-2-chloro-4-ethylpyridin-3-amine

Step 1: 5-bromo-4-ethylpyridin-2-amine

To a mixture of 4-ethylpyridin-2-amine (40 g, 327.4 mmol) and ammonium acetate (2.5 g, 32 mmol) in ACN (1,200 mL) was added NBS (61.2 g, 343 mmol) at rt. The reaction mixture was allowed to stir for 1 min at rt. The reaction mixture was then diluted with water and extracted with EtOAc. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide 5-bromo-4-ethylpyridin-2-amine (60 g, 91%).

Step 2: 5-bromo-4-ethyl-3-nitropyridin-2-amine

To a solution of 5-bromo-4-ethylpyridin-2-amine (35 g, 174 mmol) in concentrated H₂SO₄ (520 mL) was added HNO₃ (18 mL, 261 mmol) dropwise at rt. The reaction mixture was allowed to stir for 3 h at rt. The reaction mixture was then poured into a mixture of ice (800 g) and water (800 g). The pH was adjusted to 10 by addition of aqueous NaOH solution. The resulting light yellow precipitate was collected by filtration and washed with water twice (200 mL). The filter cake was dissolved in THF (70 mL) at 45° C. Water (500 mL) was added and the mixture was allowed to stir for 1 h at −10° C. to 0° C. The crude compound was collected by filtration to provide 5-bromo-4-ethyl-3-nitropyridin-2-amine (50 g, 58%). ¹H NMR (400 MHz, CDCl₃) δ 8.28 (s, 1H), 5.78 (s, 2H), 2.85 (q, J=7.6 Hz, 2H), 1.32 (t, J=7.6 Hz, 3H).

Step 3: 5-bromo-4-ethyl-3-nitropyridin-2(1H)-one

To a solution of 5-bromo-4-ethyl-3-nitropyridin-2-amine (53 g, 215 mmol) in H₂SO₄ (20 wt %, 1600 mL) was added a solution of NaNO₂ (29.7 g, 430 mmol) in water (140 mL) dropwise at −5° C. The reaction mixture was allowed to stir for 30 min at −5° C. The resulting pale yellow precipitate was collected by filtration and washed with water (200 mL). The crude compound was dried under vacuum to provide 5-bromo-4-ethyl-3-nitropyridin-2(1H)-one (41 g, 77%). ¹H NMR (400 MHz, CDCl₃) δ 7.72 (s, 1H), 2.67 (q, J=7.6 Hz, 2H), 1.28 (t, J=7.6 Hz, 3H).

Step 4: 5-bromo-2-chloro-4-ethyl-3-nitropyridine

To a solution of 5-bromo-4-ethyl-3-nitropyridin-2(1H)-one (41 g, 166 mmol) in POCl₃ (200 mL) was added DMF (41 mL, 531 mmol) at rt. The reaction mixture was allowed to stir at 120° C. for 2 h. Then, POCl₃ was removed by distillation. The residue was poured into water slowly and the pH was adjusted to pH=6-8 by the addition of aqueous NaHCO₃. The aqueous layer was extracted with EtOAc, and the combined organic solutions were dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide 5-bromo-2-chloro-4-ethyl-3-nitropyridine (34 g, 59%). ¹H NMR (400 MHz, CDCl₃) δ 8.59 (s, 1H), 2.74 (q, J=7.6 Hz, 2H), 1.26 (t, J=7.6 Hz, 3H).

Step 5: 5-bromo-2-chloro-4-ethylpyridin-3-amine

To a solution of 5-bromo-2-chloro-4-ethyl-3-nitropyridine (32 g, 121 mmol) in EtOH (300 mL) and water (75 mL) was added NH₄Cl (19.4 g, 361 mmol) and Fe (20.2 g, 362 mmol) in portions at reflux. The reaction mixture was allowed to stir at reflux for 30 min. The reaction mixture was filtered through celite and concentrated. The aqueous solution was extracted with EtOAc, and the combined organic solutions were dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide 5-bromo-2-chloro-4-ethylpyridin-3-amine (26 g, 91%). ¹H NMR (400 MHz, CDCl₃) δ 7.90 (s, 1H), 4.12 (s, 2H), 2.75 (q, J=7.6 Hz, 2H), 1.18 (t, J=7.6 Hz, 3H). LCMS (FA): m/z=235.0 (M+H).

Synthesis of reagent (dt) from Example 34D: N-(5-bromo-2,4-dimethylpyridin-3-yl)-2,4-difluorobenzenesulfonamide

Step 1: Dimethyl 2-(5-bromo-4-methyl-3-nitropyridin-2-yl)malonate

To a suspension of NaH (60% in mineral oil, 0.64 g, 0.016 mol) in DMF (14 mL) was slowly added dimethyl malonate (1.70 mL, 0.0149 mol). After addition, the reaction mixture was allowed to stir for 10 min. 2-chloro-3-nitro-5-bromo-4-picoline (2.50 g, 9.90 mmol) in DMF (4.7 mL) was added. The resulting orange mixture was allowed to stir at 40° C. overnight. The mixture was carefully poured in 0.5M NaHCO₃ and extracted with Et₂O twice. The combined organic solutions were washed with brine, dried over Na₂SO₄, and concentrated to give dimethyl (5-bromo-4-methyl-3-nitropyridin-2-yl) malonate (3.17 g, 90%). LCMS (FA): m/z=347.3 (M+H).

Step 2: 5-Bromo-2,4-dimethyl-3-nitropyridine

To dimethyl (5-bromo-4-methyl-3-nitropyridin-2-yl)malonate (2.75 g, 7.92 mmol) was added 12.0 M of hydrochloric acid (15 mL, 0.18 mol). The reaction mixture was allowed to stir at 105° C. until LCMS showed complete conversion. The reaction mixture was diluted with 100 mL of brine and was extracted with Et₂O three times. The organic solutions were combined, washed with brine twice, dried over Na₂SO₄, filtered and concentrated. The crude product was purified by column chromatography to give 5-bromo-2,4-dimethyl-3-nitropyridine (1.15 g, 60%). LCMS (FA): m/z=231.0 (M+H).

Step 3: 5-Bromo-2,4-dimethylpyridin-3-amine

To a flask containing 5-bromo-2,4-dimethyl-3-nitropyridine (1.15 g, 4.98 mmol) was added EtOH (4.3 mL), water (4.3 mL), iron (1.17 g, 20.9 mmol) and ammonium chloride (1.17 g, 21.8 mmol). The reaction mixture was allowed to stir at reflux for 2 h. The reaction mixture was filtered through celite and the filtrate was concentrated to give a crude solid. The solid was triturated with water and filtered to give 5-bromo-2,4-dimethylpyridin-3-amine (630 mg, 69%). LCMS (FA): m/z=201.0 (M+H).

Step 4: N-(5-Bromo-2,4-dimethylpyridin-3-yl)-2,4-difluorobenzenesulfonamide

To a solution of 5-bromo-2,4-dimethylpyridin-3-amine (0.20 g, 0.99 mmol) in pyridine (1.04 mL, 12.9 mmol) was added 2,4-difluorobenzene-1-sulfonyl chloride (0.171 mL, 1.27 mmol) The mixture was allowed to stir at 80° C. for 3 h. The reaction mixture was concentrated and the crude product was purified by column chromatography to give product as a mixture of mono and bis sulfamate. The product mixture was dissolved in MeOH (10 mL) and 1N NaOH (10 mL) and allowed to heat at 50° C. overnight. The reaction mixture turned into clear solution, and LCMS showed complete reaction. The pH of the solution was adjusted to 5-6 by the addition of 1N HCl. The mixture was extracted with EtOAc. The organic solutions were combined and concentrated to give the crude product, which was purified by column chromatography to give N-(5-bromo-2,4-dimethylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (187 mg, 50%). LCMS (FA): m/z=379.0 (M+H).

The intermediates listed in the table below (Table 28) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 28 Starting Material Intermediate Reagent Chemical Structure LCMS Data

dx

LCMS (FA): m/z = 393.2 (M + H)

dx

LCMS (FA): m/z = 324.4 (M + H) dz

dz

LCMS (FA): m/z = 308.0 (M + H)

Example 34H: 6-chloro-4-methyl-N-2′-(2-methylpyrimidin-4-yl)-3,4′-bipyridine-2′,5-diamine (I-226)

A mixture of 5-bromo-2-chloro-4-methylpyridin-3-amine (0.59 g, 2.67 mmol), 2-methyl-N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)pyrimidin-4-amine (0.92 g, 2.94 mmol) and Pd(dppf)Cl₂, complex with DCM (1:1) (0.074 g, 0.090 mmol) in 1,4-dioxane (20 mL) and 1M aqueous K₂CO₃ (2.6 mL) was subjected to microwave irradiation for 30 min at 130° C. The reaction mixture was allowed to cool to rt and filtered through celite. The filtrate was diluted with EtOAc, and the solution was washed with water, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide 6-chloro-4-methyl-N-2′-(2-methylpyrimidin-4-yl)-3,4′-bipyridine-2′,5-diamine I-226 (0.25 g, 29%). LCMS (FA): m/z=327.1 (M+H).

The compounds listed in the table below (Table 29) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 29 Starting Material Compound LCMS Example Reagent Chemical Structure No. Data 34I ea*

I-256 LCMS (FA): m/z = 341.2 (M + H) 34J ea*

I-314 LCMS (FA): m/z = 355.2 (M + H) 34Q ea{circumflex over ( )}

I-480 LCMS (FA): m/z = 318.0 (M + H) 34S ea{circumflex over ( )}

I-355 LCMS (FA): m/z = 353.0 (M + H) eb

34T¹ ea{circumflex over ( )}

I-479 LCMS (FA): m/z = 322.1 (M + H) 34U² ea{circumflex over ( )}

I-390 LCMS (FA): m/z = 385.2 (M + H) 34V¹ ea{circumflex over ( )}

I-363 LCMS (FA): m/z = 384.2 (M + H) 34W¹ ea{circumflex over ( )}

I-471 LCMS (FA): m/z = 362.2 (M + H) 34X¹ ea{circumflex over ( )}

I-446 LCMS (FA): m/z = 336.2 (M + H) 34Y¹ ea{circumflex over ( )}

I-424 LCMS (FA): m/z = 338.2 (M + H) 34Z¹ ea{circumflex over ( )}

I-379 LCMS (FA): m/z = 365.2 (M + H) 34AA³ ea{circumflex over ( )}

I-475 LCMS (FA): m/z = 370.1 (M + H) 34AB⁴ ea{circumflex over ( )}

I-454 LCMS (FA): m/z = 519.1 (M + H) 34AC⁵ ea

I-336 LCMS (FA): m/z = 418.2 (M + H) 34AD⁵ ea

I-422 LCMS (FA): m/z = 402.2 (M + H) 34AE⁵ ea

I-349 LCMS (FA): m/z = 399.2 (M + H) 34AF⁵ ea

I-440 LCMS (FA): m/z = 414.2 (M + H) *Conditions: XPhosG3 and XPhos instead of Pd(dppf)Cl₂ and K₃PO₄ instead of K₂CO₃ {circumflex over ( )}SiliaCat DPP-Pd used instead of Pd(dppf)Cl₂ ¹Reagent ea is synthesized using the below procedure described for 5-bromo-3-ethoxy-2-methyl-pyridine by reacting an appropriate alkyl halide with 5-bromo-2-methyl-pyridin-3-ol ²Reagent ea is synthesized using K₂CO₃, DMSO, and MW irradiation at 170 C. by reacting 2-fluoro-5-methyl pyridine with 5-bromo-2-methyl-pyridin-3-ol ³Reagent ea is synthesized by reacting 5-bromo-2-methyl-pyridin-3-ol, diphenyliodonium trifluoromethanesulfonate and NaOtBu in THF at 70 C. ⁴Reagent ea is synthesized according to the procedure for reagent u from example 9BG ⁵Reagent ea is synthesized according to the below procedure described for intermediates of example 34AC, 34AD, 34AE, 34AF

Synthesis of reagent (ea) from Examples 341 and 34 J: 5-bromo-2-chloro-N,4-dimethylpyridin-3-amine and 5-bromo-2-chloro-N,N,4-trimethylpyridin-3-amine

tBuOK (1.0 M in THF, 10.0 mL, 10.0 mmol) was added dropwise to a stirring solution of 5-bromo-2-chloro-4-methylpyridin-3-amine (0.74 g, 3.35 mmol) in THF (12 mL). The reaction mixture was allowed to stir at rt for 30 min then MeI (1.0 mL, 17 mmol) was added dropwise and the reaction mixture was allowed to stir at rt for 16 h. The reaction mixture was filtered and the filtrate was diluted with EtOAc and then washed with water. The organic solution was dried over Na₂SO₄, filtered, and concentrated. The crude compound was purified by column chromatography to provide 5-bromo-2-chloro-N,4-dimethylpyridin-3-amine (0.37 g, 46.5%). LCMS (FA): m/z=235.1 (M+H) and 5-bromo-2-chloro-N,N,4-trimethylpyridin-3-amine (0.36 g, 43.8%). LCMS (FA): m/z=249.1 (M+H).

Synthesis of reagents (ea) from Example 34T: 5-bromo-3-ethoxy-2-methyl-pyridine

To 5-bromo-2-methyl-pyridin-3-ol (200 mg, 1.06 mmol) were added K₂CO₃ (441 mg, 3.19 mmol) and DMF (7 mL). To this iodoethane (0.257 mL 3.19 mmol), was added and the reaction mixture was allowed to stir at 70° C. overnight. The reaction mixture was partitioned into EtOAc and aqueous 1N NaOH soln. The aqueous solution was extracted twice. The organic solutions were combined, washed with brine, dried over MgSO₄, filtered and excess solvent was removed under reduced pressure. The residue was purified by column chromatography to give the 5-bromo-3-ethoxy-2-methyl-pyridine as a yellow oil (0.138 g, 60% yield). LCMS (FA): m/z=216.0/218.0 (M+, M+2).

Synthesis of reagent (ea) from Example 34AF: 3-Chloro-5-[(4-fluoro-2,3-dihydro-1H-inden-1-yl)oxy]pyridine

Step 1: N′-[(1E)-4-fluoro-2,3-dihydro-1H-inden-1-ylidene]-4-methylbenzenesulfonohydrazide

A round bottomed flask equipped with a stir bar was charged with 4-fluoroindan-1-one (444 mg, 2.96 mmol), 4-methylbenzenesulfonohydrazide (551 mg, 2.96 mmol) and toluene (8 mL). The resulting mixture was allowed to stir at 110° C. for 10 min, then was cooled to rt. The precipitate which formed was collected by suction filtration and was dried under high vacuum to provide N-[(1E)-4-fluoro-2,3-dihydro-1H-inden-1-ylidene]-4-methylbenzenesulfonohydrazide (0.94 g, 72% yield) as an off-white solid. LCMS (FA): m/z=319.1 (M+H).

Step 2: 3-Chloro-5-[(4-fluoro-2,3-dihydro-1H-inden-1-yl)oxy]pyridine

A 5 mL microwave tube equipped with a stir bar was charged with 5-chloropyridin-3-ol (232 mg, 1.79 mmol), N-[(1E)-4-fluoro-2,3-dihydro-1H-inden-1-ylidene]-4-methylbenzenesulfonohydrazide (285 mg, 0.895 mmol), potassium carbonate (433 mg, 3.13 mmol), and fluorobenzene (3 ml). The tube was sealed and the reaction mixture was subjected to microwave irradiation at 160° C. for 1 h. The reaction mixture was allowed to cool to rt, then the vial was opened and the reaction mixture was poured into stirring 1N NaOH. The resulting mixture was extracted with DCM. The organic solutions were combined, washed with 1 N NaOH and saline, dried with MgSO₄, filtered, and concentrated. The crude compound was purified by column chromatography to provide 3-chloro-5-[(4-fluoro-2,3-dihydro-1H-inden-1-yl)oxy]pyridine (0.236 g, 34%) as a white solid. LCMS (FA): m/z=264.0 (M+H). ¹H NMR (400 MHz, DMSO-d6) δ ppm 8.34 (d, J=2.51 Hz, 1H), 8.26 (d, J=1.76 Hz, 1H), 7.78 (t, J=2.26 Hz, 1H), 7.26-7.36 (m, 2H), 7.18 (t, J=8.51 Hz, 1H), 6.06 (dd, J=6.53, 3.51 Hz, 1H), 3.02-3.12 (m, 1H), 2.93 (ddd, J=16.38, 8.72, 4.77 Hz, 1H), 2.59-2.70 (m, 1H), 2.10 (dddd, J=13.68, 8.66, 4.77, 3.76 Hz, 1H).

The compounds listed in the table below (Table 29a) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 29a Starting Material Compound Intermediate Reagent Chemical Structure No. LCMS Data From example 34AC gm

I-336 LCMS (FA): m/z = 314.0 (M + H) gn

From example 34AD gm

I-422 LCMS (FA): m/z = 296.0 (M + H) gn

gp

From example 34AE gm

I-349 LCMS (FA): m/z = 294.2 (M + H) gn

gp

Example 35: N-{6-chloro-5′-fluoro-4-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}-2,4-difluorobenzenesulfonamide (I-294)

A mixture of N-(2-chloro-4-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl)-2,4-difluorobenzenesulfonamide (0.162 g, 0.364 mmol) (see Example 1 above), N-(4-chloro-5-fluoropyridin-2-yl)-2-methylpyrimidin-4-amine (0.067 g, 0.280 mmol) (see Example 1 above), XPhos (0.004 g, 0.008 mmol), XPhosG3 (0.007 g, 0.008 mmol), and degassed K₃PO₄ (0.50 M in water, 1.10 mL, 0.56 mmol) in degassed 1,4-dioxane (1.0 mL) was allowed to stir at 105° C. for 2 h. The reaction was allowed to cool to rt and then filtered through celite. The filtrate was diluted with EtOAc and then washed with water. The organic solution was dried over Na₂SO₄, filtered, and concentrated. The crude compound was purified by column chromatography to provide N-{6-chloro-5′-fluoro-4-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}-2,4-difluorobenzenesulfonamide I-294 (0.11 g, 75%). LCMS (FA): m/z=521.1 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.69 (s, 1H), 10.39 (s, 1H), 8.46 (d, J=0.9 Hz, 1H), 8.35 (d, J=5.9 Hz, 1H), 8.31 (s, 1H), 7.87-7.74 (m, 2H), 7.68-7.55 (m, 1H), 7.51 (d, J=5.9 Hz, 1H), 7.34-7.23 (m, 1H), 2.46 (s, 3H), 2.24 (s, 3H).

The compounds listed in the table below (Table 30) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 30 Starting Material Compound Example Reagent Chemical Structure No. LCMS Data 35A ee

I-264 LCMS (FA): m/z = 565.1 (M + H) 35B ef

I-237 LCMS (FA): m/z = 523.1 (M + H) ee

35C ee

I-296 LCMS (FA): m/z = 529.1 (M + H) 35D ee

I-218 LCMS (FA): m/z = 517.1 (M + H) 35E ee

I-225 LCMS (FA): m/z = 519.1 (M + H) 35F ef

I-217 LCMS (FA): m/z = 386.1 (M + H) ee

35G ef

I-309 LCMS (FA): m/z = 453.1 (M + H) ee

35H ef

I-239 LCMS (FA): m/z = 455.1 (M + H) ee

35I ef

I-286 LCMS (FA): m/z = 400.1 (M + H) ee

35J ef

I-291 LCMS (FA): m/z = 469.1 (M + H) ee

35K ee

I-272 LCMS (FA): m/z = 502.1 (M + H) 35L ee

I-238 LCMS (FA): m/z = 527.3 (M + H) 35M ef

I-229 LCMS (FA): m/z = 424.0 (M + H) ee

35N ef

I-289 LCMS (FA): m/z = 493.0 (M + H) ee

35O ee

I-300 LCMS (FA): m/z = 514.0 (M + H) 35P ee

I-293 LCMS (FA): m/z = 503.1 (M + H) 35Q ef

I-228 LCMS (FA): m/z = 479.2 (M + H) ee

35R ef

I-301 LCMS (FA): m/z = 457.1 (M + H) ee

35S ef

I-307 LCMS (FA): m/z = 469.1 (M + H) ee

35T ef

I-276 LCMS (FA): m/z = 468.1 (M + H) ee

35U ef

I-265 LCMS (FA): m/z = 455.1 (M + H) ee

35V ef*

I-233 LCMS (FA): m/z = 494.1 (M + H) ee

35W ef

I-297 LCMS (FA): m/z = 454.2 (M + H) ee

35X ef

I-310 LCMS (FA): m/z = 455.2 (M + H) ee

35Y ef*

I-235 LCMS (FA): m/z = 519.6 (M + H) ee

35Z ef*

I-271 LCMS (FA): m/z = 510.2 (M + H) ee

35AA ef**

I-281 LCMS (FA): m/z = 308.5 (M + H) ee

35AB ef

I-231 LCMS (FA): m/z = 187.1 (M + H) ee

35AC ef

I-263 LCMS (FA): m/z = 424.1 (M + H) ee

35AD ee***

I-287 LCMS (FA): m/z = 411.0 (M + H) 35AE ef

I-219 LCMS (FA): m/z = 435.2 (M + H) ee

35AF ef

I-305 LCMS (FA): m/z = 459.1 (M + H) ee

35AG ee**

I-255 LCMS (FA): m/z = 469.0 (M + H) 35AH ef**

I-313 LCMS (FA): m/z = 474.1 (M + H) ee

35AI ef**

I-241 LCMS (FA): m/z = 366.1 (M + H) ee

35AK ef

I-324 LCMS (FA): m/z = 505.1 (M + H) ee

35AM ef

I-326 LCMS (FA): m/z = 515.1 (M + H) ee

35AN ef

I-389 LCMS (FA): m/z = 449.1 (M + H) ee

35AO ef

I-364 LCMS (FA): m/z = 380.1 (M + H) ee

35AP ef

I-414 LCMS (FA): m/z = 433.3 (M + H) ee

35AQ ef{circumflex over ( )}¹

I-332 LCMS (FA): m/z = 379.1 (M + H) ee

35AR ee

I-383 LCMS (FA): m/z = 483.0 (M + H) 35AU ef

I-375 LCMS (FA): m/z = 500.1 (M + H) ee

35AV ef

I-382 LCMS (FA): m/z = 510.1 (M + H) ee

35AW ee

I-456 LCMS (FA): m/z = 465.1 (M + H) ef

35AX ee

I-417 LCMS (FA): m/z = 450.9 (M + H) ef

*Coupling using Pd(PPh₃)₄ and Cs₂CO₃ **Coupling using Pd(dppf)Cl₂ and K₂CO₃ ***Coupling using Pd(PPh₃)₄ and K₂CO₃, subjected to microwave irradiation {circumflex over ( )}Coupling using Pd(dppf)Cl₂ and K₂CO₃, subjected to microwave irradiation {circumflex over ( )}{circumflex over ( )}Coupling using Pd₂(dba)₃, Xphos, KOAc/water ¹Reagent ef prepared according to standard procedures described for boronate synthesis in the intermediates section

Synthesis of reagent (ee) from Example 35AE: N-(4-bromo-1-oxidopyridin-2-yl)acetamide

To a solution of N-(4-bromopyridin-2-yl)acetamide (350 mg, 1.6 mmol) in DCM (20 mL) was added mCPBA (1.26 g, 7.3 mmol) at 0° C. The reaction mixture was allowed to stir at rt for 3 h. The reaction mixture was then diluted with water and saturated K₂CO₃ solution, and extracted with DCM. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide N-(4-bromo-1-oxidopyridin-2-yl)acetamide (340 mg, 90%). LCMS (FA): m/z=231.3 (M+H).

Synthesis of reagent (ee) from Example 35AH: N-(4-bromopyridin-2-yl)pyrrolidine-1-carboxamide

Step 1: N-(4-bromopyridin-2-yl)-3-oxobutanamide

2-Amino-4-bromopyridine (5.00 g, 29.0 mmol) was added portionwise to a refluxing solution of 3-oxobutanoic acid ethyl ester (3.70 mL, 29.0 mmol) in xylenes (15 mL) over 1 h. The reaction was allowed to cool to rt and was concentrated. DCM was added to the residue and the mixture was filtered. The filtrate was concentrated and the crude compound was purified by column chromatography to provide N-(4-bromopyridin-2-yl)-3-oxobutanamide (0.60 g, 8%). LCMS (FA): m/z=257.2 (M+H).

Step 2: N-(4-bromopyridin-2-yl)pyrrolidine-1-carboxamide

A solution of N-(4-bromopyridin-2-yl)-3-oxobutanamide (0.13 mg, 0.52 mmol) and pyrrolidine (0.40 mL, 5.0 mmol) in toluene (10 mL) was allowed to stir at reflux for 3.5 h. The reaction was allowed to cool to rt and was concentrated. The crude compound was purified by column chromatography to give N-(4-bromopyridin-2-yl)pyrrolidine-1-carboxamide (0.07 g, 47%). LCMS (FA): m/z=270.1 (M+H).

Synthesis of reagent (ee) from Example 35AF: N-(4-chloropyridin-2-yl)cyclobutanecarboxamide

Cyclobutanecarboxylic acid (0.659 mL, 6.98 mmol) was added to a stirring solution of 2-amino-4-chloropyridine (0.833 g, 6.48 mmol), T3P (50% in EtOAc, 4.2 mL, 7.0 mmol), and TEA (1.95 mL, 14.0 mmol) in THF (10 mL). The resulting solution was allowed to stir in an oil bath at 41° C. overnight under an atmosphere of nitrogen. The reaction was allowed to cool to rt and was quenched by pouring into stirring saline (˜30 mL). The reaction mixture was extracted with EtOAc. The organic solutions were combined, washed with saline, dried over MgSO₄, filtered, and concentrated to give the crude product. The crude product was purified by column chromatography to give N-(4-chloropyridin-2-yl)cyclobutanecarboxamide (0.892 g, 65% yield) as a white solid. LCMS (FA): m/z=211.1 (M+H).

Synthesis of reagent (ee) from Example 35AC: 1-(4-bromopyridin-2-yl)-4-methyl-1H-imidazo[4,5-c]pyridine

Step 1: 4-bromo-N-(2-methyl-3-nitropyridin-4-yl)pyridin-2-amine

A mixture of 4-amino-3-nitro-2-picoline (0.267 g, 1.74 mmol), 4-bromo-2-fluoropyridine (0.44 g, 2.50 mmol) and cesium carbonate (1.74 g, 5.33 mmol) in DMF (4.0 mL) was allowed to stir at 80° C. for 1.5 h. The reaction mixture was extracted with EtOAc. The organic solutions were combined, washed with 10% lithium chloride solution, dried over Na₂SO₄, filtered and concentrated to give crude 4-bromo-N-(2-methyl-3-nitropyridin-4-yl)pyridin-2-amine as a yellow solid which was used without purification.

Step 2: N⁴-(4-bromopyridin-2-yl)-2-methylpyridine-3,4-diamine

To 4-bromo-N-(2-methyl-3-nitropyridin-4-yl)pyridin-2-amine in hydrochloric acid (12 M, 4.36 mL, 52.3 mmol) was added tin(II) chloride dihydrate (1.19 g, 5.23 mmol) at 0° C. After addition, the reaction mixture was allowed to warm to rt and stir overnight. The reaction mixture was cooled to 0° C. and basified by the addition of concentrated sodium hydroxide solution to pH=9. The mixture was evaporated and the crude product was purified by chromatography to give N⁴-(4-bromopyridin-2-yl)-2-methylpyridine-3,4-diamine (0.19 g, 39%), as a white powder. LCMS (FA): m/z=279.0 (M+H).

Step 3: 1-(4-bromopyridin-2-yl)-4-methyl-1H-imidazo[4,5-c]pyridine

To a mixture of N-(4-bromopyridin-2-yl)-2-methylpyridine-3,4-diamine (0.055 g, 0.20 mmol) and p-toluenesulfonic acid (0.0197 mmol) in a round bottom flask was added trimethyl orthoformate (3.00 g, 28.3 mmol) and the mixture was allowed to stir at 60° C. for 2 h. The reaction mixture was evaporated and the residue was purified by column chromatography to give 1-(4-bromopyridin-2-yl)-4-methyl-1H-imidazo[4,5-c]pyridine as a white powder (22 mg, 38%). LCMS (FA): m/z=289.0 (M+H).

Synthesis of reagent (ee) from Example 35AW: Ethyl (4-chloropyridin-2-yl)carbamate

EtOH (0.741 mL, 12.7 mmol) was added to a stirring solution of 4-chloropicolinic acid (1.00 g, 6.35 mmol), 50% T3P in EtOAc (4.2 mL, 7.0 mmol), azidotrimethylsilane (0.93 mL, 7.0 mmol), and TEA (1.3 mL, 9.5 mmol) in THF (10 mL). The resulting solution was allowed to stir at reflux overnight under an atmosphere of nitrogen. After cooling to rt, the reaction mixture was poured into stirring saline (˜30 mL). The precipitate which formed was collected on a flitted funnel, washed with water, and dried to give the crude product as a tan powder. The crude compound was purified by column chromatography to provide ethyl (4-chloropyridin-2-yl)carbamate (0.93 g, 73%) as a white powder. LCMS (FA): m/z=201.0 (M+H).

The compounds listed in the table below (Table 30a) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 30a Intermediate Starting Material ee Reagent Chemical Structure Compound No. LCMS Data From example 35AK ee″

I-324 LCMS (FA): m/z = 301.1 (M + H) From example 35AM ee″

I-326 LCMS (FA): m/z = 311.1 (M + H)

Synthesis of reagent (ee) from Example 35AP: N-(4-chloro-6-methylpyridin-2-yl)acetamide

To a solution of 4-chloro-6-methylpyridin-2-amine (416 mg, 2.92 mmol) in acetic anhydride (5.89 mL) was added DMAP (3.6 mg, 0.029 mmol). The reaction mixture was allowed to stir at 140° C. for 3 h. The reaction mixture was concentrated and purified by column chromatography to provide N-(4-chloro-6-methylpyridin-2-yl)acetamide (420 mg, 78%). LCMS (FA): m/z=185.0 (M+H).

Example 36: N-(6-chloro-5-{[(2,4-difluorophenyl)sulfonyl]amino}-4-methyl-3,4′-bipyridin-2′-yl)cyclopropane carboxamide (I-308)

Step 1: N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide

To a solution of 5-bromo-2-chloro-4-methylpyridin-3-amine (12 g, 54 mmol) in THF (360 mL) was added LiHMDS (1M in THF, 108 mL, 108 mmol) at −5° C. The reaction mixture was allowed to stir at −5° C. for 10 min. To the reaction mixture 2,4-difluorobenzenesulfonyl chloride (17.3 g, 81 mmol) was added. The reaction mixture was allowed to stir at rt for 12 h. The reaction mixture was diluted with water and extracted with EtOAc. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (11.5 g, 53%). LCMS (FA): m/z=396.9 (M+H). ¹H NMR (400 MHz, CDCl₃) δ 8.37 (s, 1H), 7.71 (m, 1H), 7.00 (m, 2H), 6.70 (s, 1H), 2.64 (s, 3H).

Step 2: N-(6-chloro-5-{[(2,4-difluorophenyl)sulfonyl]amino}-4-methyl-3,4′-bipyridin-2′-yl)cyclopropane carboxamide (I-308)

A mixture of N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzenesulfonamide (6.75 g, 17 mmol), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]cyclopropanecarboxamide (5.87 g, 20.4 mmol) and Pd(dppf)Cl₂, complex with DCM (1:1) (470 mg, 0.57 mmol) in 1,4-dioxane (133 mL) and K₂CO₃ (1M in water, 34 mL) was allowed to stir at 105° C. overnight. The reaction mixture was diluted with water and extracted with EtOAc. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude product was purified by column chromatography to provide N-(6-chloro-5-{[(2,4-difluorophenyl)sulfonyl]amino}-4-methyl-3,4′-bipyridin-T-yl)cyclopropanecarboxamide I-308 (6.5 g, 80%). LCMS (FA): m/z=479.3 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 11.01 (s, 1H), 10.63 (s, 1H), 8.42 (d, J=5.2 Hz, 1H), 8.20 (s, 1H), 8.06 (s, 1H), 7.79 (m, 1H), 7.62 (m, 1H), 7.25 (m, 1H), 7.13 (dd, J=5.2, 1.6 Hz, 1H), 2.23 (s, 3H), 2.03 (m, 1H), 0.82 (m, 4H).

The compounds listed in the table below (Table 31) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 31 Starting Material Example Reagent Chemical Structure Compound No. LCMS Data 36A eh

I-254 LCMS (FA): m/z = 515.0 (M + H) ej*

36B eh

I-251 LCMS (FA): m/z = 435.1 (M + H) ej

36C eh

I-227 LCMS (FA): m/z = 453.1 (M + H) ej

36D eh

I-290 LCMS (FA): m/z = 469.3 (M + H) ej

36E eh

I-240 LCMS (FA): m/z = 450.9 (M + H) ej

36F eh

I-243 LCMS (FA): m/z = 484.9 (M + H) ej

36G eh

I-312 LCMS (FA): m/z = 417.1 (M + H) ej

36H ej*

I-250 LCMS (FA): m/z = 467.0 (M + H) 36I eh

I-236 LCMS (FA): m/z = 384.1 (M + H) ej

*SiliaCat DPP-Pd and K₂CO₃ were used instead of Pd(dppf)Cl₂ and K₂CO₃

Example 37: 6-amino-N-(bicyclo[1.1.1]pent-1-yl)-2′-((2-methoxypyrimidin-4-yl)amino)-N-methyl-[3,4′-bipyridine]-5-carboxamide (I-230)

Step 1: 2-Amino-N-(bicyclo[1.1.1]pentan-1-yl)-5-bromonicotinamide

To 2-amino-5-bromonicotinic acid (2.00 g, 9.22 mmol) in DCM (87 mL) were added DIEA (4.5 mL, 25 mmol) and TBTU (4.4 g, 13.8 mmol). The reaction mixture was allowed to stir at rt for 20 min. To the reaction mixture was added bicyclo[1.1.1]pent-1-amine hydrochloride salt (0.73 g, 6.14 mmol). The reaction mixture was allowed to stir overnight at rt and was then diluted with water and DCM. The organic solution was separated, washed with brine, dried over MgSO₄, filtered and concentrated. The crude product was purified by column chromatography to give 2-amino-N-(bicyclo[1.1.1]pent-1-yl)-5-bromonicotinamide (0.67 g, 39%) as a white solid. LCMS (FA): m/z=282.0 (M+H).

Step 2: 2-amino-N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-N-methylnicotinamide

To a flask under an atmosphere of N₂ were added 2-amino-N-(bicyclo[1.1.1]pent-1-yl)-5-bromonicotinamide (0.66 g, 2.34 mmol) and THF (19 mL). The reaction mixture was allowed to stir at 0° C. To this cooled solution, tBuOK (1M in THF, 2.11 mL, 2.11 mmol) was added drop wise. The reaction mixture was allowed to stir for 1 h. Methyl iodide (0.73 mL, 11.70 mmol) was added at 0° C. and the reaction mixture was allowed to stir for 5 h. The reaction mixture was filtered. The filtrate was concentrated and the residue was purified by column chromatography to give 2-amino-N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-N-methylnicotinamide as a white foamy solid. (0.46 g, 66%). LCMS (FA): m/z=296.0 (M+H).

Step 3: (6-amino-5-(bicyclo[1.1.1]pent-1-yl(methyl)carbamoyl)pyridin-3-yl)boronic acid

A mixture of 2-amino-N-(bicyclo[1.1.1]pent-1-yl)-5-bromo-N-methylnicotinamide (0.393 g, 1.33 mmol), bis(pinacolato)diboron (0.404 g, 1.59 mmol), Pd(dppf)Cl₂ (0.131 g, 0.159 mmol) and potassium acetate (0.384 g, 3.91 mmol) in 1,4-dioxane (15 mL) was allowed to stir between 82-85° C. under an atmosphere of nitrogen for 8 h. The reaction mixture was filtered through celite. The filter cake was washed with EtOAc. The filtrate was concentrated to give crude (6-amino-5-(bicyclo[1.1.1]pent-1-yl(methyl)carbamoyl)pyridin-3-yl)boronic acid, which was used without further purification. (0.34 g, 98%). LCMS (FA): m/z=262.1 (M+H).

Step 4: 6-amino-N-(bicyclo[1.1.1]pent-1-yl)-2′-((2-methoxypyrimidin-4-yl)amino)-N-methyl-[3,4′-bipyridine]-5-carboxamide

A mixture of N-(4-chloropyridin-2-yl)-2-methoxypyrimidin-4-amine (0.141 g, 0.596 mmol), (6-amino-5-(bicyclo[1.1.1]pent-1-yl(methyl)carbamoyl)pyridin-3-yl)boronic acid (0.115 g, 0.442 mmol) in 1,4-dioxane (1.3 mL), XPhos (0.0092 g, 0.019 mmol), XPhosG3 (0.018 mg, 0.021 mmol) and potassium phosphate (0.05M in water, 2.55 mL, 1.27 mmol) under an atmosphere of nitrogen was allowed to stir at 90° C. for 2.5 h. The reaction mixture was filtered through celite. The filter cake was washed with MeOH and the filtrate was concentrated. The residue was purified by column chromatography to give 6-amino-N-(bicyclo[1.1.1]pent-1-yl)-2′-(2-methoxypyrimidin-4-yl)amino)-N-methyl-[3,4′-bipyridine]-5-carboxamide I-230 (0.080 g, 43%) as a yellow solid. LCMS (FA): m/z=418.1 (M+H).

The compounds listed in the table below (Table 32) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 32 Starting Material LCMS Example Reagent Chemical Structure Compound No. Data 37A ek*

I-245 LCMS (FA): m/z = 403.1 (M + H) 37B ek*

I-234 LCMS (FA): m/z = 387.2 (M + H) ep

37C ek*

I-275 LCMS (FA): m/z = 401.2 (M + H) ep

37D ep

I-277 LCMS (FA): m/z = 402.2 (M + H) *NaH was used instead of tBuOK in Step 2 **HATU was used instead of TBTU in Step 1 ***Final coupling with reagent en using Pd(PPh₃)₄, 1M Na₂CO₃, EtOH, Toluene, MW at 120° C.

Example 38: Azetidin-1-yl(6-methyl-2′-((2-methylpyrimidin-4-yl)amino)-3,4′-bipyridin-5-yl)methanone (I-304)

Step 1: Azetidin-1-yl(5-bromo-2-methylpyridin-3-yl)methanone

To 5-bromo-2-methylnicotinic acid (0.420 g, 1.94 mmol) in DCM (12.3 mL) were added DIEA (0.34 mL, 1.94 mmol), TBTU (1.25 g, 3.89 mmol) and azetidine (0.087 mL, 1.30 mmol). The reaction mixture was allowed to stir at rt. Excess solvent was removed under reduced pressure. The reaction mixture was diluted with EtOAc, washed with aqueous saturated NaHCO₃ solution, washed with brine, dried over MgSO₄, filtered and concentrated under reduced pressure. The residue was purified by column chromatography to give azetidin-1-yl(5-bromo-2-methylpyridin-3-yl)methanone (0.35 g, 80%). LCMS (FA): m/z=255.0 (M+H)

Step 2: (5-(Azetidine-1-carbonyl)-6-methylpyridin-3-yl)boronic acid

To azetidin-1-yl(5-bromo-2-methylpyridin-3-yl)methanone (0.20 g, 0.78 mmol) and bis(pinacolato)diboron (239 mg, 0.94 mmol) were added Pd(dppf)Cl₂ (77 mg, 0.094 mmol), potassium acetate (227 mg, 2.31 mmol) and 1,4-dioxane (8.63 mL). The flask was flushed with N₂ and then allowed to stir at 90° C. for 6.5 h. The reaction mixture was filtered through celite. The filter cake was washed with EtOAc. The filtrate was concentrated to give (5-(azetidine-1-carbonyl)-6-methylpyridin-3-yl)boronic acid. The crude material was used without purification. (0.17 g, 84%). LCMS (FA): m/z=221.0 (M+H).

Step 3: Azetidin-1-yl(6-methyl-2′-((2-methylpyrimidin-4-yl)amino)-3,4′-bipyridin-5-yl)methanone

To a vial were added N-(4-chloropyridin-2-yl)-2-methylpyrimidin-4-amine (230.15 mg, 1.04 mmol), a solution of [5-(azetidin-1-ylcarbonyl)-6-methylpyridin-3-yl]boronic acid (170 mg, 0.77 mmol) in 1,4-dioxane (2.2 mL), XPhos (16.04 mg, 0.034 mmol), XPhosG3 (31.18 mg, 0.037 mmol) and 0.500 M of potassium phosphate in water (4.45 mL, 2.23 mmol). The vial was thoroughly flushed with N₂ and allowed to stir at 90° C. for 2.5 h. The reaction mixture was filtered through celite. The filter cake was washed with MeOH and the filtrate was concentrated. The residue was partitioned into EtOAc and water. The aqueous solution was extracted twice with EtOAc. The combined organic solutions were washed with brine, dried over MgSO₄, filtered and concentrated. The crude product was purified by column chromatography to give azetidin-1-yl(6-methyl-2′-(2-methylpyrimidin-4-yl)amino)-3,4′-bipyridin-5-yl)methanone I-304 (0.16 g, 58%). LCMS (FA): m/z=361.2 (M+H).

The compounds listed in the table below (Table 33) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 33 Starting Material Example Reagent Chemical Structure Compound No. LCMS Data 38A eu*

I-246 LCMS (FA): m/z = 387.2 (M + H) 38B eu*

I-292 LCMS (FA): m/z = 415.1 (M + H) 38C er

I-266 LCMS (FA): m/z = 349.1 (M + H) 38D eq

I-252 LCMS (FA): m/z = 463.2 (M + H) er

*Step 3: microwave irradiation was used instead of conventional heating

Example 39: 6-methyl-2′-((2-methylpyrimidin-4-yl)amino)-[3,4′-bipyridine]-5-carboxylic acid (I-253) and N-(cyclopropylmethyl)-6-methyl-2′-((2-methylpyrimidin-4-yl)amino)-[3,4′-bipyridine]-5-carboxamide (I-285)

Step 1: 6-Methyl-2′-((2-methylpyrimidin-4-yl)amino)-3,4′-bipyridine-5-carboxylic acid

To a microwave vial were added 2-methyl-N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]pyrimidin-4-amine (101 mg, 0.325 mmol), 5-bromo-2-methylnicotinic acid (70.19 mg, 0.325 mmol), Pd(dppf)Cl₂ (7.43 mg, 0.0090 mmol), potassium carbonate (61.07 mg, 0.44 mmol), 1,4-dioxane (2.2 mL, 28 mmol) and water (0.053 mL, 2.92 mmol). The vial was thoroughly flushed with N₂ and then subjected to microwave irradiation at 125° C. for 40 min. The reaction mixture was filtered and the solid obtained was dried and purified by column chromatography to give 6-methyl-2′-((2-methylpyrimidin-4-yl)amino)-[3,4′-bipyridine]-5-carboxylic acid I-253 (0.036 g, 34%). LCMS (FA): m/z=322.0 (M+H).

Step 2: N-(Cyclopropylmethyl)-6-methyl-2′-((2-methylpyrimidin-4-yl)amino)-3,4′-bipyridine-5-carboxamide

To 6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridine-5-carboxylic acid (50.00 mg, 0.156 mmol) were added DCM (1.48 mL, 23.03 mmol) and DIEA (0.081 mL, 0.48 mmol) and TBTU (74.94 mg, 0.23 mmol). To this stirred reaction mixture, cyclopropylmethylamine (0.068 mL, 0.78 mmol) was added and the reaction mixture was allowed to stir at rt for 5 h. The reaction mixture was partitioned into EtOAc and water. The aqueous solution was extracted twice with EtOAc. The combined organic solutions were washed with brine, dried over MgSO₄, filtered and concentrated. The crude product was purified by column chromatography to give N-(cyclopropylmethyl)-6-methyl-2′-((2-methylpyrimidin-4-yl)amino)-3,4′-bipyridine-5-carboxamide as a white solid I-285 (0.021 g, 36%). LCMS (FA): m/z=375.2 (M+1).

The compounds listed in the table below (Table 34) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 34 Starting Material Example Reagent Chemical Structure Compound No. LCMS Data 39A ey

I-221 LCMS (FA): m/z = 397.1 (M + H)

Example 40: Azetidin-1-yl{6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}methanethione (I-223)

A mixture of azetidin-1-yl{6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}methanone (110 mg, 0.30 mmol) and P₂S₅ (170 mg, 0.76 mmol) in pyridine (10 mL) was allowed to stir for 12 h at 65° C. The reaction mixture was then added to a mixture of NaHCO₃ solution (1.0 M, 10 mL) and water (10 mL). The reaction mixture was allowed to stir for 30 min at rt, then was diluted with water and extracted with EtOAc. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide azetidin-1-yl{6-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}methanethione I-223 (95 mg, 83%). LCMS (FA): m/z=377.5 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.24 (s, 1H), 8.83 (d, J=3.0 Hz, 1H), 8.39 (d, J=6.0 Hz, 1H), 8.37 (d, J=6.0 Hz, 1H), 8.10 (s, 1H), 7.92 (d, J=2.4 Hz, 1H), 7.63 (d, J=6.0 Hz, 1H), 7.40 (dd, J=5.2, 1.6 Hz, 1H), 4.30 (m, 2H), 4.06 (m, 2H), 2.54 (s, 3H), 2.49 (s, 3H), 2.30 (m, 2H).

Example 41: N-{6-chloro-4-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}-2,4-difluorobenzamide (I-295)

Step 1: N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzamide

To a solution of 5-bromo-2-chloro-4-methylpyridin-3-amine (0.50 g, 2.26 mmol) in DCM (6.76 mL) and pyridine (0.54 mL, 6.77 mmol) at 0° C. was added dropwise a solution of 2,4-difluorobenzoyl chloride (0.47 g, 2.67 mmol) in DCM (2.5 mL). The reaction mixture was allowed to stir in an ice bath for 5 h. The resulting white precipitate was collected by filtration and dried under vacuum to give N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzamide as a white solid (0.576 g, 70.5%). LCMS (FA): m/z=361.0 (M+H).

Step 2: N-{6-chloro-4-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}-2,4-difluorobenzamide

A mixture of N-(5-bromo-2-chloro-4-methylpyridin-3-yl)-2,4-difluorobenzamide (0.22 g, 0.61 mmol), 2-methyl-N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]pyrimidin-4-amine (0.23 g, 0.75 mmol), XPhos (0.09 g, 0.02 mmol), XPhosG3 (0.02 g, 0.02 mmol), degassed K₃PO₄ (0.50 M in water, 2.43 mL, 1.21 mmol) and degassed 1,4-dioxane (2.13 mL) was allowed to stir at 105° C. for 2 h. The reaction was allowed to cool to rt and then filtered through celite. The filtrate was diluted with EtOAc and then washed with water. The organic solution was dried over Na₂SO₄, filtered, and concentrated. The crude compound was purified by column chromatography to provide N-{6-chloro-4-methyl-2′-[(2-methylpyrimidin-4-yl)amino]-3,4′-bipyridin-5-yl}-2,4-difluorobenzamide I-295 (0.03 g, 6%). LCMS (FA): m/z=467.2 (M+H).

The compounds listed in the table below (Table 35) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 35 Starting Material Example Reagent Chemical Structure Compound No. LCMS Data 41A ez

I-249 LCMS (FA): m/z = 433.2 (M + H)

Example 42: 6-methyl-5-(6-methyl-1,1-dioxido-1,2,6-thiadiazinan-2-yl)-N-(2-methylpyrimidin-4-yl)-3,4′-bipyridin-2′-amine (I-288)

Step 1: N-(5-bromo-2-methylpyridin-3-yl)-N′-(3-chloropropyl)sulfuric diamide

To a mixture of 5-bromo-2-methylpyridin-3-amine (0.874 g, 4.67 mmol) and (3-chloropropyl)sulfamyl chloride (2.567 g, 13.37 mmol) in an ice bath was added pyridine (8.65 mL). The mixture was allowed to stir at rt overnight. Additional (3-chloropropyl)sulfamyl chloride (2.0 g, 10.0 mmol) was added and the mixture was allowed to continue stirring at rt for another 24 h. The reaction mixture was extracted with EtOAc. The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to give N-(5-bromo-2-methylpyridin-3-yl)-N-(3-chloropropyl)sulfuric diamide as a white solid (0.83 g, 52%). LCMS (FA): m/z=342.1 (M+H).

Step 2: 2-(5-bromo-2-methylpyridin-3-yl)-1,2,6-thiadiazinane 1,1-dioxide

To a round bottomed flask was added N-(5-bromo-2-methylpyridin-3-yl)-N-(3-chloropropyl)sulfuric diamide (0.83 g, 2.43 mmol), potassium carbonate (0.672 g, 4.86 mmol), and ACN (40 mL). The reaction mixture was allowed to stir at 65° C. overnight. The reaction mixture was allowed to cool to rt, concentrated and the residue purified by column chromatography to give 2-(5-bromo-2-methylpyridin-3-yl)-1,2,6-thiadiazinane 1,1-dioxide as a solid (0.74 g, 100%). LCMS (FA): m/z=306.0 (M+H).

Step 3: 2-(5-bromo-2-methylpyridin-3-yl)-6-methyl-1,2,6-thiadiazinane 1,1-dioxide

To a solution of 2-(5-bromo-2-methylpyridin-3-yl)-1,2,6-thiadiazinane 1,1-dioxide (0.773 g, 2.52 mmol), EtOH (30 mL), and MeI (0.63 mL, 10.1 mmol) was added sodium hydroxide (1M in water, 6.3 mL). The mixture was allowed stir at rt overnight. The reaction mixture was acidified with 1M HCl and then concentrated. The crude compound was purified by column chromatography to give 2-(5-bromo-2-methylpyridin-3-yl)-6-methyl-1,2,6-thiadiazinane 1,1-dioxide as an off white solid (0.81 g, 100%). LCMS (FA): m/z=320.0 (M+H).

Step 4: 2-methyl-6-[2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]-1,2,6-thiadiazinane 1,1-dioxide

A mixture of 2-(5-bromo-2-methylpyridin-3-yl)-6-methyl-1,2,6-thiadiazinane 1,1-dioxide (0.333 g, 1.04 mmol), bis(pinacolato)diboron (0.290 g, 1.14 mmol), [Pd(dppf)Cl₂, complex with DCM (1:1) (85 mg, 0.10 mmol) and potassium acetate (0.31 g, 3.18 mmol) in 1,4-dioxane (4 mL) was allowed to stir at 90° C. for 3 days. The reaction mixture was filtered through celite. The filtrate was mixed with charcoal (0.97 g) and the mixture was allowed to stir at 80° C. for 1 h. The mixture was then filtered and the filtrate was concentrated to give 2-methyl-6-[2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]-1,2,6-thiadiazinane 1,1-dioxide as off white solid.

Step 5: 6-methyl-5-(6-methyl-1,1-dioxido-1,2,6-thiadiazinan-2-yl)-N-(2-methylpyrimidin-4-yl)-3,4′-bipyridin-2′-amine

To a mixture of 2-methyl-6-[2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-3-yl]-1,2,6-thiadiazinane 1,1-dioxide (0.150 g, 0.327 mmol), 4-chloro-N-(2-methylpyrimidin-4-yl)pyrimidin-2-amine (0.056 g, 0.25 mmol), XPhosG3 (8.5 mg, 0.0091 mmol), and XPhos (4.3 mg, 0.0091 mmol) were added 1,4-dioxane (1 mL) and potassium phosphate (0.50 M in water, 1 mL). The reaction mixture was subjected to microwave irradiation at 100° C. for 30 min. The reaction mixture was concentrated and the crude compound was purified by column chromatography to give 6-methyl-5-(6-methyl-1,1-dioxido-1,2,6-thiadiazinan-2-yl)-N-(2-methylpyrimidin-4-yl)-3,4′-bipyridin-T-amine I-288 (0.045 g, 42%). LCMS (FA): m/z=425.9 (M+H).

Example 43: 6-chloro-N-cyclobutyl-2′-((2-methylpyrimidin-4-yl)amino)-[3,4′-bipyridine]-5-sulfonamide (I-215)

Step 1: 5-bromo-2-chloro-N-cyclobutylpyridine-3-sulfonamide

A partial suspension of cyclobutylamine hydrochloride salt (0.39 g, 3.64 mmol) in pyridine (0.8 mL) was treated dropwise with a solution of 5-bromo-2-chloropyridine-3-sulfonyl chloride (0.52 g, 1.79 mmol) in DCM (1 mL) and the mixture was allowed to stir at rt for 16 h. The solvent was evaporated under reduced pressure and the residue was treated with ice cold 1N HCl and extracted with EtOAc. The organic solution was washed with water and dried over MgSO₄, filtered and the solvent was evaporated. The crude product was purified by column chromatography to give 5-bromo-2-chloro-N-cyclobutylpyridine-3-sulfonamide (0.58 g, 58%). LCMS (FA): m/z=325.1 (M+H).

Step 2: 6-chloro-N-cyclobutyl-2′-((2-methylpyrimidin-4-yl)amino)-[3,4′-bipyridine]-5-sulfonamide

A partial suspension of 5-bromo-2-chloro-N-cyclobutylpyridine-3-sulfonamide (0.050 g, 0.15 mmol) and 2-methyl-N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]pyrimidin-4-amine (0.052 g, 0.166 mmol) in 1,4-dioxane (2.0 mL) was treated with potassium carbonate (0.042 g, 0.30 mmol) in water (0.20 mL) and purged with nitrogen gas. Pd(dppf)Cl₂ (40 mg, 0.05 mmol) was added and the mixture was allowed to stir in a sealed tube at 100° C. for 0.5 h. The solvents were evaporated under reduced pressure and the residue was diluted with water and the precipitate collected. The crude product was purified by column chromatography to give 6-chloro-N-cyclobutyl-2′-(2-methylpyrimidin-4-yl)amino)-[3,4′-bipyridine]-5-sulfonamide I-215 (30 mg, 46%). LCMS (FA): m/z=431.1 (M+H). ¹H NMR (400 MHz, MeOH-d₄) δ 8.96 (d, J=4.0 Hz, 1H), 8.74 (d, J=4.0 Hz, 1H), 8.44 (d, J=4.0 Hz, 1H), 8.30 (m, 2H), 7.50 (d, J=4.0 Hz, 1H), 7.41 (dd, J=8.0, 4.0 Hz, 1H), 3.83 (m, 1H), 2.61 (s, 3H), 2.04 (m, 4H), 1.60 (m, 2H).

The compounds listed in the table below (Table 36) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 36 Starting Material Example Reagent Chemical Structure Compound No. LCMS Data 43A ff

I-279 LCMS (AA): m/z = 413.0 (M + H) 43B ff

I-224 LCMS (AA): m/z = 427.1 (M + H) 43C fe

I-242 LCMS (FA): m/z = 442.6 (M + H) ff

43D fd

I-410 LCMS (FA): m/z = 397.2 (M + H) fe

ff

fg*

43E ff′

I-470 LCMS (FA): m/z = 388.7 (M + H) fg**

43F ff′

I-426 LCMS (FA): m/z = 376.7 (M + H) fg**

43G ff

I-366 LCMS (FA): m/z = 392.7 (M + H) fg**

43H fe

I-432 LCMS (FA): m/z = 467.3 (M + H) ff′

fg*

43I fe

I-358 LCMS (FA): m/z = 435.2 (M + H) ff′

fg

43J fe

I-344 LCMS (FA): m/z = 467.3 (M + H) ff′

fg

43K fe

I-329 LCMS (FA): m/z = 467.4 (M + H) ff′

fg***

43L fd

I-442 LCMS (FA): m/z = 393.4 (M + H) fe

ff′

fg*

43M fd

I-353 LCMS (FA): m/z = 419.4 (M + H) fe

ff′′′

fg^(Λ)

43N fd

I-370 LCMS (FA): m/z = 363.3 (M + H) fe

ff′′′

fg^(Λ)

43O fd

I-330 LCMS (FA): m/z = 447.3 (M + H) fe

fg^(Λ)

43P fd

I-403 LCMS (FA): m/z = 447.3 (M + H) fe

fg^(Λ)

43Q ff′

I-491 LCMS (FA): m/z = 448.5 (M + H) fg*

43R ff′

I-436 LCMS (FA): m/z = 392.2 (M + H) fg*

43S ff′

I-487 LCMS (FA): m/z = 406.2 (M + H) fg*

*Step 2: Cs₂CO₃ was used instead of K₂CO₃, and microwave irradiation was used instead of conventional heating **Step 2: Cs₂CO₃ was used instead of K₂CO₃ ***Step 2: microwave irradiation was used instead of conventional heating ^(Λ)Step 2: Pd₂(dba)₃, Xphos, KOAc/water, dioxane, 110° C.

Example 43T: N-(4-(1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-b][1,4,5]oxathiazepin-8-yl)pyridin-2-yl)acetamide (I-484)

Step 3: N-(4-(1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-b][1,4,5]oxathiazepin-8-yl)pyridin-2-yl)acetamide

A solution of N-{6-chloro-5-[(2-hydroxyethyl)sulfamoyl]-3,4′-bipyridin-2′-yl}acetamide (0.033 g, 0.089 mmol) in DMSO (0.6 mL, 8 mmol) was treated with KOt-Bu (0.0210 g, 0.187 mmol) as a solution in THF, The reaction mixture was allowed to stir at rt for 3 h and then concentrated. The crude product was purified by column chromatography to give N-(4-(1,1-dioxido-3,4-dihydro-2H-pyrido[2,3-b][1,4,5]oxathiazepin-8-yl)pyridin-2-yl)acetamide (I-484). LCMS (FA): m/z=335.1 (M+H).

The compounds listed in the table below (Table 36a) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 36a Starting Material Example Reagent Chemical Structure Compound No. LCMS Data 43U fe

I-334 LCMS (AA): m/z = 411.3 (M + H) fh

43V fe

I-420 LCMS (FA): m/z = 410.6 (M + H) fh

Example 43W: N-(5-(N-(tert-butyl)sulfamoyl)-4-methyl-[3,4′-bipyridin]-2′-yl)acetamide (I-462)

N-(5-(N-(tert-butyl)sulfamoyl)-4-methyl-[3,4′-bipyridin]-2′-yl)acetamide

To a flask containing N-[5-(tert-butylsulfamoyl)-6-chloro-4-methyl-3,4′-bipyridin-2′-yl]acetamide (60 mg, 0.2 mmol) in MeOH (1.5 mL) was added 10% palladium hydroxide on carbon (6 mg) under nitrogen. After the flask was flushed with hydrogen a few times, then the reaction mixture was allowed to stir at 40° C. for 2 h under hydrogen. The reaction mixture was filtered through celite. The filtrate was evaporated to dryness and purified by HPLC to afford N-(5-(N-(tert-butyl)sulfamoyl)-4-methyl-[3,4′-bipyridin]-2′-yl)acetamide (20 mg, 40%) LCMS (FA): m/z=363.2 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ ppm 10.70 (s, 1H) 9.02 (s, 1H) 8.61 (s, 1H) 8.44 (d, J=5.02 Hz, 1H) 8.08 (s, 1H) 7.92 (s, 1H) 7.20 (dd, J=5.02, 1.51 Hz, 1H) 2.46-2.56 (m, 3H) 2.12 (s, 3H) 1.18 (s, 9H).

Synthesis of reagents (ff′) from Examples 43A and 43B: 5-bromo-N-cyclobutyl-2-methoxypyridine-3-sulfonamide and 5-bromo-N-cyclobutyl-2-hydroxypyridine-3-sulfonamide

A solution of 5-bromo-2-chloro-N-cyclobutylpyridine-3-sulfonamide (0.12 g, 0.37 mmol) in THF (3.0 mL) was treated with a solution of sodium methoxide (0.08 g, 1.50 mmol) in MeOH (1.5 mL) and allowed to stir at 85° C. in a sealed tube for 16 h. The reaction mixture containing starting material and methoxy displacement product was treated with 25% sodium methoxide in MeOH (2 mL) and allowed to stir at 85° C. in sealed tube for 16 h. The solvents were evaporated and the residue diluted with 1 N HCl and extracted with EtOAc. The organic solution was dried over MgSO₄, filtered and evaporated to give the crude product which was purified by chromatography to give 5-bromo-N-cyclobutyl-2-methoxypyridine-3-sulfonamide (67 mg, 56%) LCMS (FA): m/z=321.1 (M+H) and 5-bromo-N-cyclobutyl-2-hydroxypyridine-3-sulfonamide (32 mg, 28%) LCMS (FA): m/z=307.1 (M+H).

The compounds listed in the table below (Table 36b.) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 36b Starting Material Reagent ff Reagent ff′ LCMS Data From Ex 43L

LCMS (FA): m/z = 339.2 (M + H) From Ex 43E

LCMS (FA): m/z = 333.3 (M − 1) From Ex 43F

LCMS (FA): m/z = 323.1 (M + H) From Ex. 43K

LCMS (FA): m/z = 411.1 (M + H) From Ex. 43J

LCMS (FA): m/z = 413.2 (M + H) From Ex. 43I

LCMS (FA): m/z = 379.1 (M + H) From Ex. 43H

LCMS (FA): m/z = 413.1 (M + H) From Ex 43Q¹

From Ex 43R²

LCMS (FA): m/z = 350.1 (M + H) From Ex 43S³

LCMS (FA): m/z = 338.1 (M + H) ¹Conditions for conversion of reagent ff to reagent ff′: dimethylamine, MeOH, 95° C. ²Conditions for conversion of reagent ff to reagent ff′: dimethylamine, THF, 70° C. ³Conditions for conversion of reagent ff to reagent ff′: methylamine, THF, 70° C.

Synthesis of reagents (fd) from Example 43x: 5-bromo-2-chloro-4-methylpyridine-3-sulfonyl chloride

To a flask with 5-bromo-2-chloro-4-methylpyridin-3-amine (1.07 g, 4.82 mmol) cooled in ice bath was added 12.0 M HCl (4.84 mL) portion wise. The mixture was allowed to stir at rt for 15 min. This was cooled in ice/acetone bath at ˜−8° C. A solution of sodium nitrite (0.399 g, 5.78 mmol) in water (1.56 mL) was added over 45 min. The resulting slurry was then allowed to stir for 30 min A solution of SO₂ was prepared the night before by adding thionyl chloride (0.879 mL, 12.0 mmol) to water (5.20 mL, 289 mmol) at 0° C. over 30 min. The mixture was allowed to stir and then warm to rt overnight. To the SO₂ mixture was added cuprous monochloride (9.4 mg, 0.095 mmol). The resulting yellow solution was cooled in ice/acetone at −8° C. To this yellow solution was added the diazotized mixture described earlier maintained at −8° C. (acetone/ice) portion wise with a pipette over 30 min. The mixture was then allowed to stir at 0° C. for 30 min. The resulting yellow solid was filtered off, washed with ice water and dried under vacuum to give 5-bromo-2-chloro-4-methylpyridine-3-sulfonyl chloride (290 mg, 20%) The product was used without further purification.

Reagents (ff′″) from Examples 43M and 43N Listed in the Table Below (Table 36b) were Prepared in an Analogous Fashion to that Described in Step 3 of Example 44 from the Appropriate Starting Materials

TABLE 36b Starting Material Reagent ff Reagent ff′′′ LCMS Data From Ex 43M

LCMS (FA): m/z = 319.2 (M + H) From Ex 43N

LCMS (FA): m/z = 263.3 (M + H) *Step 2: Cs₂CO₃ was used instead of K₂CO₃, and microwave irradiation was used instead of conventional heating **Step 2: Cs₂CO₃ was used instead of K₂CO₃

Example 44: N-[5-(bicyclo[1.1.1]pent-1-ylsulfamoyl)-6-methyl-3,4′-bipyridin-2′-yl]acetamide (I-418) and N-(6-methyl-5-sulfamoyl-3,4′-bipyridin-2′-yl)acetamide (I-395)

Step 1: 2-bromo-5-chloropyridine-3-sulfonyl chloride and 2,5-dichloropyridine-3-sulfonyl chloride

To 2-bromo-3-amino-5-chloropyridine (5.00 g, 24.1 mmol) in a 100 ml flask cooled in ice bath was added portion wise 12.0 M of HCl (24.2 mL). The mixture was allowed to stir at rt for 15 min. This was cooled in ice/acetone bath (˜−8° C.). A solution of sodium nitrite (2.00 g, 28.9 mmol) in water (7.82 mL, 434 mmol) was added over 45 min. The resulting slurry was allowed to stir for 30 min. A solution of SO₂ in water was prepared the night before by adding thionyl chloride (4.40 mL, 60.2 mmol) over 30 min. to water (26.0 mL, 1440 mmol) cooled in ice/bath. The mixture was then allowed to stir and to warm at rt overnight. To that solution was added cuprous monochloride (47 mg, 0.47 mmol). The resulting yellow solution was cooled in ice/acetone at −8° C. The diazotized mixture described earlier maintained at −8° C. (acetone/ice) was then added portionwise with pipette over 30 min. The mixture was then allowed to stir at 0° C. for 75 min. The mixture was extracted with ether twice. The combined ether extracts were washed with brine, dried over Na₂SO₄ and concentrated. The oily residue was dried under high vacuum overnight to give a 1:2 mixture (approximate based on 1H NMR (400 MHz, CDCl3)) of 2-bromo-5-chloropyridine-3-sulfonyl chloride and 2,5-dichloropyridine-3-sulfonyl chloride as a red oil (1 g of crude material). The product was used in the next step without further purification.

Step 2: N-(bicyclo[1.1.1]pent-1-yl)-2-bromo-5-chloropyridine-3-sulfonamide and N-(bicyclo[1.1.1]pent-1-yl)-2,5-dichloropyridine-3-sulfonamide

To a solution 2-bromo-5-chloropyridine-3-sulfonyl chloride and 2,5-dichloropyridine-3-sulfonyl chloride (1.0 g, 3.8 mmol) in 1,4-dioxane (8.6 mL) and pyridine (1.10 mL) at rt was added bicyclo[1.1.1]pentan-1-amine hydrochloride salt (0.527 g, 4.41 mmol) portion wise. The mixture was allowed to stir at rt for 2 h. Water (2 mL) was added and the mixture was allowed to stir for a few min. The reaction mixture was diluted with water (40 ml) and acidified to pH 4 with 0.5 citric acid and was extracted with EtOAc (2×40 ml). The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated to dryness. The residue was purified by column chromatography using to give a 1:2 mixture of N-(bicyclo[1.1.1]pent-1-yl)-2-bromo-5-chloropyridine-3-sulfonamide and N-(bicyclo[1.1.1]pent-1-yl)-2,5-dichloropyridine-3-sulfonamide as a light yellow solid (339 mg, 85% yield). LCMS (FA): m/z=337.3 and 293.3 (M+H).

Step 3: N-(bicyclo[1.1.1]pent-1-yl)-5-chloro-2-methylpyridine-3-sulfonamide

To the mixture obtained in Step 2 of N-(bicyclo[1.1.1]pent-1-yl)-2-bromo-5-chloropyridine-3-sulfonamide, N-(bicyclo[1.1.1]pent-1-yl)-2,5-dichloropyridine-3-sulfonamide (327 mg, 1.07 mmol) and [1,1-bis(diphenylphosphino)ferrocene]dichloropalladium(II) complex with DCM (1:1) (54 mg, 0.066 mmol) in 1,4-dioxane (7.5 mL) was added with caution dimethylzinc in toluene (2.0 M, 0.88 mL, 1.8 mmol) under an atmosphere of nitrogen. After a few min the mixture was heated to 75° C. then allowed to stir for 90 min. The reaction mixture was allowed to cool to rt and then added to water. The resulting solution was acidified with 0.5% citric acid and was extracted with EtOAc twice. The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated. The residue was purified by column chromatography to give N-(bicyclo[1.1.1]pent-1-yl)-5-chloro-2-methylpyridine-3-sulfonamide (85 mg, 28%). LCMS (FA): m/z=273.3 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 9.14 (s, 1H), 8.77 (d, J=2.4 Hz, 1H), 8.19 (d, J=2.4 Hz, 1H), 2.74 (s, 3H), 2.31 (s, 1H), 1.74 (s, 6H).

Step 4: N-[5-(bicyclo[1.1.1]pent-1-ylsulfamoyl)-6-methyl-3,4′-bipyridin-2′-yl]acetamide (I-418) and N-(6-methyl-5-sulfamoyl-3,4′-bipyridin-2′-yl)acetamide (I-395)

A microwave tube was charged with N-(bicyclo[1.1.1]pent-1-yl)-5-chloro-2-methylpyridine-3-sulfonamide (83 mg, 0.30 mmol), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (98.6 mg, 0.376 mmol), 2-dicyclohexylphosphino-2′,4′,6′-tri-i-propyl-1,1′-biphenyl (14 mg, 0.029 mmol), tris(dba)dipalladium(0) (8.3 mg, 0.0092 mmol) and potassium acetate (89 mg, 0.91 mmol). The tube was purged with nitrogen and 1,4-dioxane (2.4 mL) was added. The reaction mixture was allowed to stir for 2 min and water (0.51 mL) was added. The tube was purged with nitrogen three times, sealed, and was heated at 110° C. in oil bath for 1.5 h. After the reaction mixture was allowed to cool to rt, the mixture was diluted with EtOAc (25 ml) and water (15 ml). The aqueous solution was separated and further extracted with EtOAc (15 ml). The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated. The products were purified by column chromatography using 0-3% MeOH/DCM over 25 min. to give N-[5-(bicyclo[1.1.1]pent-1-ylsulfamoyl)-6-methyl-3,4′-bipyridin-2′-yl]acetamide (I-418) (25 mg, 22%) as a white solid. LCMS (FA): m/z=373.4 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.68 (s, 1H), 9.12 (s, 1H), 9.05 (d, J=2.2 Hz, 1H), 8.44-8.47 (m, 2H), 8.39 (d, J=2.2 Hz, 1H), 7.51-7.55 (m, 1H), 2.83 (s, 3H), 2.31 (s, 1H), 2.14 (s, 3H), 1.77 (s, 6H). Further elution using 6% MeOH/DCM gave by product N-(6-methyl-5-sulfamoyl-3,4′-bipyridin-2′-yl)acetamide (I-395) (24 mg, 26%) as a white solid. LCMS (FA): m/z=307.4 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.68 (s, 1H), 8.99 (d, J=2.2 Hz, 1H), 8.44-8.47 (m, 1H), 8.43-8.39 (m, 2H), 7.76 (s, 2H), 7.48-7.52 (m, 1H), 2.85 (s, 3H), 2.14 (s, 3H).

Example 45: N-[4-(8-{[(2,4-difluorophenyl)sulfonyl]amino}[1,2,4]triazolo[1,5-a]pyridin-6-yl)pyridin-2-yl]acetamide (I-340)

Step 1: 5-chloro-3-iodopyridin-2-amine

To a solution of 2-amino-5-chloropyridine (5.11 g, 39.7 mmol) in benzene (110 mL) and AcOH (2.3 mL) was added N-iodosuccinimide (8.94 g, 39.7 mmol). The reaction mixture was allowed to stir at 100° C. overnight. The mixture was diluted with EtOAc and washed with saturated NaHCO₃ and brine. The organic solution was dried over sodium sulfate, filtered and evaporated to afford crude product as dark red solid. The crude product was redissolved in EtOAc and washed with sodium bisulfite solution twice followed by brine. The solution was dried over Na₂SO₄, filtered and concentrated. The crude product was purified by column chromatography to afford 5-chloro-3-iodopyridin-2-amine as a yellow powder (1.75 g, 17.3%). LCMS (FA): m/z=254.0 (M+H).

Step 2: 6-chloro-8-iodo[1,2,4]triazolo[1,5-a]pyridine

To a mixture of 5-chloro-3-iodo-pyridin-2-ylamine (1.54 g, 6.05 mmol) in EtOH (15 mL) was added 1,1-dimethoxy-N,N-dimethylmethanamine (1.1 mL, 8.6 mmol). The reaction mixture was allowed to stir at 80° C. for 1 hr. The reaction mixture was concentrated to dryness and MeOH (7.0 mL) was added. The mixture was cooled in an ice bath. Pyridine (1.2 mL) and hydroxylamine-O-sulfonic acid (1.00 g, 8.84 mmol) were added. The mixture was allowed to stir overnight while warming to rt. The mixture was dry loaded on silica gel and purified by chromatography to afford 6-chloro-8-iodo[1,2,4]triazolo[1,5-a]pyridine as a white powder (1.09 g, 64.4%). LCMS (FA): m/z=279.9 (M+H).

Step 3: N-(6-chloro[1,2,4]triazolo[1,5-a]pyridin-8-yl)-2,4-difluorobenzenesulfonamide

A mixture of 6-chloro-8-iodo[1,2,4]triazolo[1,5-a]pyridine (0.315 g, 1.13 mmol), 2,4-difluorobenzenesulfonamide (0.258 g, 1.34 mmol), copper(I) iodide (32 mg, 0.17 mmol) and cesium carbonate (0.776 g, 2.38 mmol) were placed in a microwave vial. The vessel was evacuated and backfilled with argon 3 times. DMF (4.73 mL) and ethylenediamine (82 mg, 1.4 mmol) were added. The mixture was subjected to microwave irradiation at 120° C. for 30 min. The reaction mixture was extracted with EtOAc. The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to give N-(6-chloro[1,2,4]triazolo[1,5-a]pyridin-8-yl)-2,4-difluorobenzenesulfonamide (60 mg, 15%) as a gray solid. LCMS (FA): m/z=345.0 (M+H).

Step 4: N-[4-(8-{[(2,4-difluorophenyl)sulfonyl]amino}[1,2,4]triazolo[1,5-a]pyridin-6-yl)pyridin-2-yl]acetamide

A mixture of N-(6-chloro[1,2,4]triazolo[1,5-a]pyridin-8-yl)-2,4-difluorobenzenesulfonamide (0.060 g, 0.17 mmol), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (0.046 g, 0.17 mmol), (2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (8.19 mg, 0.0087 mmol) and 2-dicyclohexylphosphino-2′,4′,6′-tri-i-propyl-1,1′-biphenyl (8.30 mg, 0.017 mmol) were placed in a microwave vial. The vessel was evacuated and backfilled with argon 3 times. 1,4-Dioxane (1.36 mL) and potassium phosphate (0.050 M in water, 0.696 mL, 0.348 mmol) was added. The mixture was subjected to microwave irradiation at 130° C. for 30 min Additional portions of N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (0.091 g, 0.35 mmol), (2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (8.0 mg, 0.0085 mmol), 2-dicyclohexylphosphino-2′,4′,6′-tri-i-propyl-1,1′-biphenyl (8.0 mg, 0.017 mmol) and potassium phosphate (0.50 M in water, 1.00 mL) were added and the mixture was allowed to stir at 120° C. for another 20 min. The reaction mixture was extracted with EtOAc. The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to give N-[4-(8-{[(2,4-difluorophenyl)sulfonyl]amino}[1,2,4]triazolo[1,5-a]pyridin-6-yl)pyridin-2-yl]acetamide I-340 (7 mg, 9%) as a white solid. LCMS (FA): m/z=444.8 (M+H). 1H NMR (400 MHz, DMSO-d6) δ 10.70 (s, 1H), 9.25 (s, 1H), 8.55 (m, 1H), 8.40 (d, J=5.6, 1H), 8.38 (m, 1H), 8.03 (dd, J1=6.4, J2=8.4, 2H), 7.70 (m, 1H), 7.50 (d, J=5.6, 1H), 7.23 (t, J1=7.6, J2=10, 1H), 2.15 (s, 3H).

Example 46: N-[5-(1,3-oxazol-2-ylamino)-3,4′-bipyridin-2′-yl]acetamide (I-472)

Step 1: N-(5-bromo-3,4′-bipyridin-2′-yl)acetamide

A mixture of 3,5-dibromopyridine (412 mg, 1.74 mmol), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (520 mg, 2.00 mmol), Cs₂CO₃ (1.30 g, 4.00 mmol) and Pd(PPh₃)₄ (100 mg, 0.087 mmol) in 1,4-dioxane (10.0 mL) and water (2.0 mL) was subjected to microwave irradiation for 30 min at 140° C. The reaction mixture was allowed to cool to rt and diluted with DCM. The mixture was extracted with DCM and washed with water, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide N-(5-bromo-3,4′-bipyridin-2′-yl)acetamide (210 mg, 41%). LCMS (FA): m/z=292.1 (M+H).

Step 2: N-[5-(1,3-oxazol-2-ylamino)-3,4′-bipyridin-2′-yl]acetamide

A mixture of 1,3-oxazol-2-amine (80.6 mg, 0.959 mmol), N-(5-bromo-3,4′-bipyridin-2′-yl)acetamide (77.8 mg, 0.266 mmol), Pd₂(dba)₃ (24.4 mg, 0.0266 mmol), Cs₂CO₃ (217 mg, 0.666 mmol) and Xantphos (30.8 mg, 0.0532 mmol) in 1,4-dioxane (2.3 mL) was allowed to stir for 2 h at 160° C. The reaction mixture was allowed to cool to rt and diluted with DCM, and the organic solution was washed with brine twice. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide N-[5-(1,3-oxazol-2-ylamino)-3,4′-bipyridin-2′-yl]acetamide I-472 (18.5 mg, 23.5%). LCMS (FA): m/z=296.2 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.66 (s, 1H), 10.60 (s, 1H), 8.83 (d, J=2.4 Hz, 1H), 8.48 (m, 1H), 8.45 (m, 1H), 8.42 (m, 2H), 7.73 (d, J=1.0 Hz, 1H), 7.41 (dd, J=5.2, 1.6 Hz, 1H), 7.07 (d, J=1.0 Hz, 1H), 2.13 (s, 3H).

Example 47: N-[5-(6-methyl-1,1-dioxido-1,2,6-thiadiazinan-2-yl)-3,4′-bipyridin-2′-yl]acetamide (I-452)

Step 1: 2-methyl-1,2,6-thiadiazinane 1,1-dioxide

A mixture of N-methyl-1,3-propanediamine (2.06 g, 23.4 mmol) and sulfamide (0.748 g, 7.78 mmol) was sealed in a microwave vial and filled with argon. The vial was allowed to stir at 50° C. overnight and then at 160° C. for 20 min. The reaction mixture was concentrated and the residue was purified by column chromatography to give 2-methyl-1,2,6-thiadiazinane 1,1-dioxide (0.82 g, 70%).

Step 2: 2-(5-bromopyridin-3-yl)-6-methyl-1,2,6-thiadiazinane 1,1-dioxide

A mixture of 3,5-dibromopyridine (0.234 g, 0.988 mmol), 2-methyl-[1,2,6]thiadiazinane 1,1-dioxide (0.148 g, 0.988 mmol) and copper(I) oxide (0.141 g, 0.988 mmol) in pyridine (2.5 mL) was subjected to microwave irradiation at 160° C. for 20 min. The mixture was concentrated and the crude compound was purified by column chromatography 2-(5-bromopyridin-3-yl)-6-methyl-1,2,6-thiadiazinane 1,1-dioxide (0.108 g, 35.7%) as a colorless oil. LCMS (FA) m/z=306.0 (M+H).

Step 3: N-[5-(6-methyl-1,1-dioxido-1,2,6-thiadiazinan-2-yl)-3,4′-bipyridin-2′-yl]acetamide

To 2-(5-bromopyridin-3-yl)-6-methyl-1,2,6-thiadiazinane 1,1-dioxide (0.108 g, 0.353 mmol), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (0.104 g, 0.395 mmol), and tetrakis(triphenylphosphine)palladium(0) (34.2 mg, 0.0296 mmol) in a mixture of ethanol (1.30 mL) and toluene (1.30 mL) was added sodium carbonate (1.00 M in water, 0.44 mL, 0.44 mmol). The reaction mixture was subjected to microwave irradiation at 120° C. for 20 min. The reaction mixture was extracted with EtOAc. The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to give N-[5-(6-methyl-1,1-dioxido-1,2,6-thiadiazinan-2-yl)-3,4′-bipyridin-2′-yl]acetamide I-452 as a white solid (58 mg, 50%). %). LCMS (FA): m/z=362.2 (M+H). 1H NMR (400 MHz, DMSO-d6) δ 10.68 (s, 1H), 8.82 (s, 1H), 8.67 (s, 1H), 8.43 (d, J=5.2, 1H), 8.39 (s, 1H), 8.01 (s, 1H), 7.49 (d, J=5.2, 1H), 3.84 (dd, J1=5.2, J2=5.2, 2H), 3.63 (dd, J1=5.2, J2=5.2, 2H), 2.92 (s, 3H), 2.13 (s, 3H), 1.96 (m, 2H).

The compounds listed in the table below (Table 37) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 37 Com- Ex- Starting Material pound LCMS ample Reagent fk Reagent fm No. Data 47A

I-320 LCMS (FA): m/z = 347.1 (M + H)

Example 48: N-[6-methyl-5-(2-oxotetrahydropyrimidin-1 (2H)-yl)-3,4′-bipyridin-2′-yl]acetamide (I-460)

Step 1: 1-(5-bromo-2-methylpyridin-3-yl)-3-(3-chloropropyl)urea

To a suspension of 5-bromo-2-methylpyridin-3-amine (0.400 g, 2.14 mmol) in THF (5.00 mL) was added 3-chloropropyl isocyanate (0.241 mL, 2.35 mmol) under argon at rt. The reaction mixture was allowed to stir at 60° C. for 4 days. The mixture was evaporated to remove all of the solvent. The residue was purified by chromatography to give 1-(5-bromo-2-methylpyridin-3-yl)-3-(3-chloropropyl)urea (469 mg, 71%). LCMS (FA): m/z=308.1 (M+H).

Step 2: 1-(5-bromo-2-methylpyridin-3-yl)tetrahydropyrimidin-2(1H)-one

A mixture of 1-(5-bromo-2-methylpyridin-3-yl)-3-(3-chloropropyl)urea (0.213 g, 0.695 mmol) and cesium carbonate (0.679 g, 2.08 mmol) in DMF (5.00 mL) was subjected to microwave irradiation at 140° C. under argon for 20 min. The reaction mixture was diluted with water and extracted with EtOAc. The organic solutions were combined, washed with brine, dried over sodium sulfate, filtered and concentrated to give a residue, which was purified by column chromatography to give 1-(5-bromo-2-methylpyridin-3-yl)tetrahydropyrimidin-2(1H)-one as a white powder (162 mg, 86%). LCMS (FA): m/z=269.8 (M+H).

Step 3: N-[6-methyl-5-(2-oxotetrahydropyrimidin-1 (2H)-yl)-3,4′-bipyridin-2′-yl]acetamide

To a mixture of 1-(5-bromo-2-methylpyridin-3-yl)tetrahydropyrimidin-2(1H)-one (0.178 g, 0.658 mmol), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (0.207 g, 0.789 mmol) and tetrakis(triphenylphosphine)palladium(0) (22.79 mg, 0.01972 mmol) in EtOH (5.0 mL) and toluene (5.0 mL) under argon was added sodium carbonate (1.0 M in Water, 0.85 mL, 0.85 mmol). The mixture was subjected to microwave irradiation at 120° C. for 20 min. The reaction mixture was extracted with EtOAc. The organic solutions were combined, washed with brine, dried over sodium sulfate, filtered and concentrated. The residue was purified by column chromatography and then by HPLC to give N-[6-methyl-5-(2-oxotetrahydropyrimidin-1 (2H)-yl)-3,4′-bipyridin-2′-yl]acetamide I-460 as a white solid (115 mg, 54%). LCMS (FA): m/z=326.4 (M+H). 1H NMR (400 MHz, DMSO-d6) δ 10.63 (s, 1H), 867 (s, 1H), 8.37 (m, 2H), 7.93 (s, 1H), 7.45 (s, 1H), 6.71 (s, 1H), 3.66 (bs, 1H), 3.27 (m, 2H 2.46 (m, 4H), 2.05 (m, 2H).

Example 49: N-[6-amino-5-(2-oxopyrrolidin-1-yl)-3,4′-bipyridin-2′-yl]acetamide (I-337)

Steps 1 and 2: 1-(2-amino-5-bromopyridin-3-yl)pyrrolidin-2-one

To a suspension of 2,3-diamino-5-bromopyridine (0.502 g, 2.67 mmol) and pyridine (1.30 mL, 16.0 mmol) in THF (10 mL) at 0° C. was added 4-bromobutyryl chloride (0.495 g, 2.67 mmol) in THF (2 mL) slowly. After addition, the mixture was allowed to stir at the same temperature for 30 min. The mixture was quenched by the addition of saturated sodium bicarbonate solution and extracted with DCM. The organic solution was separated, dried, filtered and evaporated to give crude N-(2-amino-5-bromopyridin-3-yl)-4-bromobutanamide, which was used in the next step directly. LCMS (FA): m/z=338.0 (M+H). N-(2-amino-5-bromopyridin-3-yl)-4-bromobutanamide (430 mg) prepared above was mixed with potassium carbonate (0.74 g, 5.34 mmol) in ACN (4 mL). The mixture was subjected to microwave irradiation at 120° C. for 20 min. The solvent was removed by evaporation and the residue was purified by column chromatography to give 1-(2-amino-5-bromopyridin-3-yl)pyrrolidin-2-one as a white solid (40 mg, 5.9%). LCMS (FA): m/z=256.1 (M+H).

Step 3: N-[6-amino-5-(2-oxopyrrolidin-1-yl)-3,4′-bipyridin-2′-yl]acetamide

A mixture of 1-(2-amino-5-bromopyridin-3-yl)pyrrolidin-2-one (0.0380 g, 0.148 mmol), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (0.0506 g, 0.193 mmol) and tetrakis(triphenylphosphine)palladium(0) (5.14 mg, 0.00445 mmol) in toluene (1.3 mL) and EtOH (0.7 mL) was placed in a microwave vial. The vial was sealed, flushed with argon, and sodium carbonate (1.00 M in water, 0.178 mL, 0.178 mmol) was added. The mixture was subjected to microwave irradiation at 120° C. for 15 min. The mixture was concentrated and the crude product was purified by HPLC to give N-[6-amino-5-(2-oxopyrrolidin-1-yl)-3,4′-bipyridin-2′-yl]acetamide I-337 as a white powder (18.2 mg, 39.4%). LCMS (FA): m/z=312.2 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.58 (s, 1H), 8.60 (br, 1H), 8.42 (m, 2H), 8.37 (d, J=5.2, 1H), 8.15 (d, 1H), 7.49 (d, J=5.2, 1H), 4.66 (br, 1H), 3.30 (m, 2H), 2.90 (m, 2H), 1.95 (m, 2H)

Example 50: 6-chloro-2′-((2-cyclopropylpyrimidin-4-yl)amino)-4-methyl-[3,4′-bipyridine]-5-carboxylic acid (I-369) and azetidin-1-yl(6-chloro-2′-((2-cyclopropylpyrimidin-4-yl)amino)-4-methyl-[3,4′-bipyridin]-5-yl)methanone (I-361)

Step 1: 6-chloro-N2′-(2-cyclopropylpyrimidin-4-yl)-4-methyl-[3,4′-bipyridine]-2′,5-diamine

To a microwave vial were added 2-cyclopropyl-N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2-pyridyl]pyrimidin-4-amine (1374 mg, 4.064 mmol) and 5-bromo-2-chloro-4-methyl-pyridin-3-amine (600 mg, 2.71 mmol) and Pd-Silicat (717 mg, 0.178 mmol) and potassium carbonate (1030 mg, 0.668 mL, 7.45 mmol) and 1,4-dioxane (43.3 mL) and Water (5.70 mL). The vial was thoroughly flushed with N₂ and the vial was subjected to microwave irradiation at 125° C. for 30 min. The reaction mixture was filtered and the filter bed was washed with fresh MeOH. Excess solvent was removed under reduced pressure. The residue was partitioned into EtOAc and water. The aqueous solution was extracted twice. The org. solutions were combined, washed with brine, dried over MgSO₄, filtered and excess solvent was removed under reduced pressure. This was purified by HPLC to give the title compound as a yellow solid (0.72 gm, 76% yield) LCMS (FA): m/z=353.1 (M+H)

Step 2: 6-chloro-N-(2-cyclopropylpyrimidin-4-yl)-5-iodo-4-methyl-[3,4′-bipyridin]-2′-amine

To a flask fitted with a N₂ gas balloon and an internal temperature probe were added N-[4-(5-amino-6-chloro-4-methyl-3-pyridyl)-2-pyridyl]-2-cyclopropyl-pyrimidin-4-amine (725 mg, 2.05 mmol) and HCl (10 mmol, 1.4 mL). The reaction mixture was cooled to −5° C. and to this a solution of sodium nitrite (223 mg, 3.23 mmol) in water (29 mL) was added slowly over a period of 10 min, maintaining the temperature between −5° C. to −3° C. The reaction mixture was allowed to stir for 1 h. A solution of potassium iodide (570 mg, 3.43 mmol) in water (29 mL) was added dropwise. The reaction mixture was allowed to warm to rt and stir overnight. The reaction mixture was partitioned into water and EtOAc. The aqueous solution was separated and extracted twice. The organic solutions were combined, washed with aqueous Na₂S₂O₃ solution and brine, dried over MgSO₄, filtered and concentrated. The residue was purified by column chromatography to give 6-chloro-N-(2-cyclopropylpyrimidin-4-yl)-5-iodo-4-methyl-[3,4′-bipyridin]-2′-amine (0.23 g, 23%) as a white solid. LCMS (FA): m/z=464.0 (M+H)

Step 3: methyl 6-chloro-2′-((2-cyclopropylpyrimidin-4-yl)amino)-4-methyl-[3,4′-bipyridine]-5-carboxylate

To a flask were added N-[4-(6-chloro-5-iodo-4-methyl-3-pyridyl)-2-pyridyl]-2-cyclopropyl-pyrimidin-4-amine (204 mg, 0.434 mmol), DMSO (2.50 mL), TEA (0.69 mL, 4.95 mmol) and MeOH (1.90 mL). The flask was thoroughly degassed and then palladium (II) acetate (32.6 mg, 0.145 mmol) and 1,3-bis(diphenylphosphino)propane (61.2 mg, 0.148 mmol) were added. The flask was again degassed, flushed with carbon monoxide and then the reaction mixture was allowed to stir at 80° C. under CO overnight. MeOH was removed under reduced pressure and the reaction mixture was diluted with water. The yellowish tan colored solid that precipitated was filtered and dried. The residue was purified by column chromatography to give methyl 6-chloro-2′-(2-cyclopropylpyrimidin-4-yl)amino)-4-methyl-[3,4′-bipyridine]-5-carboxylate. (0.066 mg, 19%). LCMS (FA): m/z=396.1 (M+H).

Step 4: 6-chloro-2′-((2-cyclopropylpyrimidin-4-yl)amino)-4-methyl-[3,4′-bipyridine]-5-carboxylic acid I-369

To a flask were added methyl 2-chloro-5-[2-[(2-cyclopropylpyrimidin-4-yl)amino]-4-pyridyl]-4-methyl-pyridine-3-carboxylate (53 mg, 0.134 mmol), MeOH (0.76 mL), THF (0.76 mL) and sodium hydroxide (1.0 M in water, 0.402 mL, 0.402 mmol). The reaction mixture was allowed to stir at 50° C. overnight. Excess solvent was removed under reduced pressure. The residue was diluted with water and acidified with conc. HCl to pH between 3-4. Excess solvent was removed under reduced pressure and the residue was directly purified by HPLC to give methyl 6-chloro-2′-((2-cyclopropylpyrimidin-4-yl)amino)-4-methyl-[3,4′-bipyridine]-5-carboxylate I-369 (30 mg, 59%). LCMS (FA): m/z=382.1 (M+H).

Step 5: azetidin-1-yl(6-chloro-2′-((2-cyclopropylpyrimidin-4-yl)amino)-4-methyl-[3,4′-bipyridin]-5-yl)methanone I-361

To 2-chloro-5-[2-[(2-cyclopropylpyrimidin-4-yl)amino]-4-pyridyl]-4-methyl-pyridine-3-carboxylic acid (19 mg, 0.0498 mmol) in DCM (0.5 mL) were added DIEA (0.052 mL, 0.296 mmol) and TBTU (44 mg, 0.138 mmol). The reaction mixture was allowed to stir for 30 min and then a solution of azetidine (12.7 mg, 0.222 mmol) in DCM (1 mL) was added. The reaction mixture was allowed to stir at rt for 1 h. Additional portions of TBTU (40 mg) and azetidine (10 mg) in DCM (0.5 mL) were added. The reaction mixture was allowed to stir overnight and then partitioned between EtOAc and aqueous NaHCO₃ soln. The aqueous solution was extracted twice. The organic solutions were combined, washed with water, brine, dried over MgSO₄, filtered and concentrated. The crude product was purified by HPLC to give azetidin-1-yl(6-chloro-2′-(2-cyclopropylpyrimidin-4-yl)amino)-4-methyl-[3,4′-bipyridin]-5-yl)methanone I-361 (12 mg, 56% yield) as a white solid. LCMS (FA): m/z=421.1 (M+H). ¹H NMR (MeOH-d₄) δ: 8.43 (br d, J=4.9 Hz, 1H), 8.35 (s, 1H), 8.23 (br d, J=6.1 Hz, 1H), 7.89 (s, 1H), 7.40 (br d, J=6.0 Hz, 1H), 7.08 (br d, J=3.9 Hz, 1H, 4.29 (br d, J=5.4 Hz, 2H), 4.14 (q, J=7.8 Hz, 1H), 4.02 (q, J=8.3 Hz, 1H), 2.46 (quin, J=7.6 Hz, 2H), 2.37 (s, 3H), 2.10 (br d, J=6.0 Hz, 1H), 1.00-1.10 (m, 4H)

The compounds listed in the table below (Table 38) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 38 Starting Material Compound Example Reagent Chemical Structure No. LCMS Data 50A fp

I-457 LCMS (FA): m/z = 395.1 (M + H) ft

fu

50B fp

I-402 LCMS (FA): m/z = 356.1 (M + H) ft

50C fu

I-466 LCMS (FA): m/z = 449.1 (M + H)

Example 51: N-[5-(1,3-benzoxazol-2-ylamino)-6-methyl-3,4′-bipyridin-2′-yl]acetamide (I-392)

A mixture of 2-chloro-1,3-benzoxazole (40 uL, 0.35 mmol), N-(5-amino-6-methyl-3,4′-bipyridin-2′-yl)acetamide (65 mg, 0.27 mmol), copper iodide (9.8 mg, 0.052 mmol), potassium carbonate (148 mg, 1.07 mmol) and trans-1,2-bis(methylamino)cyclohexane (16.2 uL, 0.103 mmol) in 1,4-dioxane (1.8 mL) was allowed to stir for 48 h at 105° C. The reaction mixture was allowed to cool to rt and diluted with EtOAc, and the solution was washed with 20% ammonia solution once and brine twice. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide N-[5-(1,3-benzoxazol-2-ylamino)-6-methyl-3,4′-bipyridin-2′-yl]acetamide I-392 (2.5 mg, 2.6%). LCMS (FA): m/z=360.2 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.64 (s, 1H), 8.68 (s, 1H), 8.57 (s, 1H), 8.43 (m, 2H), 7.50 (m, 1H), 7.46 (m, 1H), 7.40 (m, 1H), 7.22 (m, 1H), 7.15 (m, 1H), 2.60 (s, 3H), 2.13 (s, 3H).

Example 52: N-(2′-acetamido-3,4′-bipyridin-5-yl)-2,4-difluoro-N-methylbenzamide (I-397)

Step 1: N-(5-bromopyridin-3-yl)-2,4-difluorobenzamide

A flask containing 3-amino-5-bromopyridine (0.500 g, 2.89 mmol) was evacuated and backfilled with argon. Pyridine (0.70 mL) and DCM (8 mL) were added and the mixture was allowed to stir at 0° C. 2,4-difluorobenzoyl chloride (0.510 g, 2.89 mmol) was dissolved in DCM (3 mL) and added dropwise to the reaction mixture. The reaction mixture was allowed to stir at the same temperature until the starting material was consumed. The reaction mixture was extracted with EtOAc. The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography as a pale yellow powder (0.83 g, 91%). LCMS (FA): m/z=314.0 (M+H).

Step 2: N-(5-bromopyridin-3-yl)-2,4-difluoro-N-methylbenzamide

Sodium hydride (0.125 g, 5.21 mmol) and DMF (5.00 mL) were placed in a vial under argon gas. The reaction mixture was allowed to stir at 0° C. for 10 min. N-(5-bromopyridin-3-yl)-2,4-difluorobenzamide (0.272 g, 0.868 mmol) was added to the mixture, followed by methyl iodide (0.270 mL, 4.34 mmol). The mixture was stirred at the same temperature until starting material was consumed. The reaction mixture was quenched with ammonium chloride solution and extracted with EtOAc. The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography as a pale yellow oil (0.212 g, 74%). LCMS (FA): m/z=328.7 (M+H).

Step 3: N-(2′-acetamido-3,4′-bipyridin-5-yl)-2,4-difluoro-N-methylbenzamide

A vial containing N-(5-bromopyridin-3-yl)-2,4-difluoro-N-methylbenzamide (0.200 g, 0.611 mmol), EtOH (4 mL), toluene (4 mL), N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide (0.208 g, 0.795 mmol) and tetrakis(triphenylphosphine)palladium(0) (0.0212 g, 0.0183 mmol) was evacuated and backfilled with argon. Sodium carbonate (1.0 M in Water, 0.734 mL, 0.734 mmol) was added. The mixture was subjected to microwave irradiation at 120° C. for 20 min. The reaction mixture was extracted with EtOAc. The organic solutions were combined, washed with brine, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography as a brown oil I-397 (0.238 g, 100%). LCMS (FA): m/z=383.3 (M+H). ¹H NMR (400 MHz, CDCl₃) δ=8.72 (s, 1H), 8.46-8.31 (m, 3H), 7.74 (br s, 1H), 7.50 (q, J=7.7 Hz, 1H), 7.29 (s, 1H), 7.20-7.09 (m, 1H), 6.92 (br t, J=7.5 Hz, 1H), 6.64 (br s, 1H), 3.56 (s, 3H), 3.51 (d, J=4.3 Hz, 1H), 2.27 (s, 3H)

The compounds listed in the table below (Table 39) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 39 Starting Material Compound LCMS Example Reagent Chemical Structure No. Data 52A fv

I-331 LCMS (FA): m/z = 413.1 (M + H) 52B fv*

I-398 LCMS (FA): m/z = 397.5 (M + H) *Step 2: Cs₂CO₃ DMF, 110° C., microwave irradiation

Example 53: N-(2′-((2-cyclopropylpyrimidin-4-yl)amino)-6-methyl-[3,4′-bipyridin]-5-yl)-3,3-difluoroazetidine-1-carboxamide (I-368)

Step 1: N-(5-bromo-2-methyl-3-pyridyl)-3,3-difluoro-azetidine-1-carboxamide

To 5-bromo-2-methyl-pyridin-3-amine (300 mg, 1.60 mmol) were added DCM (9.0 mL) and 1,1′-carbonyldiimidazole (280 mg, 1.73 mmol). The reaction mixture was allowed to stir at rt overnight. To this stirred solution, 3,3-difluoroazetidine hydrochloride salt (300 mg, 2.32 mmol) was added and the reaction mixture was allowed to stir at 50° C. for 6 h. Excess solvent was removed under reduced pressure. The reaction was diluted with DCM and the solution was washed with aqueous saturated NaHCO₃ solution. The organic solution was separated, washed with water and brine, dried over MgSO₄, filtered and concentrated. The crude product was purified by column chromatography to give N-(5-bromo-2-methyl-3-pyridyl)-3,3-difluoro-azetidine-1-carboxamide (0.093 gm, 19%) as a pale yellow oil. LCMS (FA): m/z=307 (M+H).

Step 2: N-(2′-((2-cyclopropylpyrimidin-4-yl)amino)-6-methyl-[3,4′-bipyridin]-5-yl)-3,3-difluoroazetidine-1-carboxamide

To a microwave vial were added 2-cyclopropyl-N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2-pyridyl]pyrimidin-4-amine (129 mg, 0.383 mmol), Pd-silicat (101.9 mg, 0.0254 mmol), K₂CO₃ (92 mg, 0.66 mmol) and a solution of N-(5-bromo-2-methyl-3-pyridyl)-3,3-difluoro-azetidine-1-carboxamide (75 mg, 0.245 mmol) in 1,4-dioxane (3.35 mL) and water (480 μL,). The vial was thoroughly flushed with N₂ and then subjected to microwave irradiation at 120° C. for 30 min. The reaction mixture was filtered and washed with MeOH. Excess solvent was removed under reduced pressure. The residue was then diluted with EtOAc and washed with aqueous saturated NaHCO₃. The organic solution was separated, washed with water and brine, dried over MgSO₄, filtered and concentrated. The residue was purified by column chromatography to give N-(2′-((2-cyclopropylpyrimidin-4-yl)amino)-6-methyl-[3,4′-bipyridin]-5-yl)-3,3-difluoro azetidine-1-carb oxamide I-368 (0.054 gm, 51%) as a white solid. LCMS (FA): m/z=438.2 (M+1). ¹H NMR (MeOH-d₄) δ: 8.67 (s, 1H), 8.39 (d, J=5.3 Hz, 1H), 8.31 (s, 1H), 8.22 (s, 1H), 8.23-8.20 (m, 2H), 7.34 (br d, J=5.1 Hz, 1H), 7.27 (d, J=5.9 Hz, 1H), 4.50 (t, J=12.2 Hz, 4H), 2.60 (s, 3H), 2.15 (br d, J=4.4 Hz, 1H), 1.05-1.21 (m, 4H)

The compounds listed in the table below (Table 40) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 40 Starting Material Compound Example Reagent Chemical Structure No. LCMS Data 53A gd

I-482 LCMS (FA): m/z = 412.1 (M + H) 53B gb*

I-367 LCMS (FA): m/z = 364.0 (M + H) gc

gd

53C gb

I-439 LCMS (FA): m/z = 412.1 (M + H) gc

gd

53E ga

I-407 LCMS (FA): m/z = 437.1 (M + H) gc

gd

*Step 1 Conditions: THF, 55° C. **Step 1 Conditions: 1,1′-thiocarbonyl-diimidazole was used instead of CDI

Examples 54a and 54b: 6-benzyl-3-[2-[(2-methylpyrimidin-4-yl)amino]-4-pyridyl]-7,8-dihydro-1,6-naphthyridin-5-one (I-378) and 3-[2-[(2-methylpyrimidin-4-yl)amino]-4-pyridyl]-7,8-dihydro-6H-1,6-naphthyridin-5-one (I-406)

Step 1: (5-bromo-2-methyl-3-pyridyl)-(1-piperidyl)methanone

To (5-bromo-2-methyl-3-pyridyl)-(1-piperidyl)methanone (2.0 g, 7.06 mmol) in DMF (51.6 mL, 666 mmol) were added HATU (6.93 g, 18.2 mmol), piperidine (3.85 mL, 38.9 mmol) and DIEA (6.79 mL, 38.9 mmol). The mixture allowed to stir at rt overnight. Excess solvent was removed under reduced pressure. The reaction mixture was diluted with EtOAc, washed with saturated NaHCO₃ solution, washed with brine, dried over MgSO₄, filtered and concentrated under reduced pressure. The residue was purified by column chromatography to provide (5-bromo-2-methyl-3-pyridyl)-(1-piperidyl)methanone (2.0 g, 95%). LCMS (FA): m/z=283.1 (M+H)

Step 2: 2-(benzylamino)acetonitrile

To a suspension of benzylamine (1.0 mL, 9.2 mmol) and potassium carbonate (3.0 g, 22.0 mmol) in ACN (25.4 mL) was added chloroacetonitrile (0.90 mL, 14.0 mmol). The reaction mixture was allowed to stir at 60° C. for 16 h. The reaction was allowed to cool to rt and excess solvent was removed. The reaction mixture was diluted with DCM, washed with saturated NaHCO₃ solution and brine, dried over MgSO₄, filtered and concentrated under reduced pressure. The residue was purified by column chromatography to give 2-(benzylamino)acetonitrile (1.2 g, 90%). LCMS (FA): m/z=147.2 (M+H).

Step 3: 6-benzyl-3-bromo-7,8-dihydro-1,6-naphthyridin-5-one

To a stirred solution of n-butyllithium (2.5 M in hexane, 3.5 mL, 8.65 mmol) in THF (7.3 mL, 89.0 mmol) was added piperidine, 2,2,6,6-tetramethyl-(1.59 mL, 9.39 mmol) at −10° C. The reaction mixture was allowed to stir at 0° C. for 30 min. Then the reaction mixture was allowed to cool to −78° C. and (5-bromo-2-methyl-3-pyridyl)-(1-piperidyl)methanone (0.70 g, 2.47 mmol) in THF (7.0 mL) was added over 5 min, immediately followed by dropwise addition of 2-(benzylamino)acetonitrile (0.39 g, 2.71 mmol) in THF (6.0 mL). The reaction mixture was allowed to stir to −78° C. for 7 h. The reaction mixture was diluted with saturated aqueous NH₄Cl (2 mL) and extracted with EtOAc. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude compound was purified by column chromatography to provide 6-benzyl-3-bromo-7,8-dihydro-1,6-naphthyridin-5-one (0.784 g, 41.6%). LCMS (FA): m/z=318.1 (M+H).

Step 4: 6-benzyl-3-[2-[(2-methylpyrimidin-4-yl)amino]-4-pyridyl]-7,8-dihydro-1,6-naphthyridin-5-one

A mixture of [2-methyl-N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]pyrimidin-4-amine (0.190 g, 0.609 mmol), 6-benzyl-3-bromo-7,8-dihydro-1,6-naphthyridin-5-one (0.161 g, 0.50 mmol) and Pd(dppf)Cl₂, complex with DCM (1:1) (0.060 g, 0.073 mmol) in 1,4-dioxane (3.96 mL) and K₂CO₃ (1M in water, 1 mL) was allowed to stir at 100° C. overnight. The reaction mixture was diluted with water and extracted with EtOAc. The organic solutions were combined, dried over Na₂SO₄, filtered and concentrated. The crude product was purified by column chromatography to provide 6-benzyl-3-[2-[(2-methylpyrimidin-4-yl)amino]-4-pyridyl]-7,8-dihydro-1,6-naphthyridin-5-one I-378 (0.212 g, 98%). LCMS (FA): m/z=423.2 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.28 (s, 1H), 9.03 (d, J=2.4 Hz, 1H), 8.54 (d, J=2.4 Hz, 1H), 8.42 (d, J=5.2 Hz, 1H), 8.36 (d, J=5.9 Hz, 1H), 8.13 (s, 1H), 7.67 (d, J=5.9 Hz, 1H), 7.46 (dd, J=5.3, 1.6 Hz, 1H), 7.37 (d, J=4.4 Hz, 4H), 7.34-7.27 (m, 1H), 4.78 (s, 2H), 3.64 (t, J=6.8 Hz, 2H), 3.19 (t, J=6.7 Hz, 2H), 2.50 (s, 3H).

Step 5: 3-[2-[(2-methylpyrimidin-4-yl)amino]-4-pyridyl]-7,8-dihydro-6H-1,6-naphthyridin-5-one

To a solution of 6-benzyl-3-[2-[(2-methylpyrimidin-4-yl)amino]-4-pyridyl]-7,8-dihydro-1,6-naphthyridin-5-one (0.166 g, 0.393 mmol)] in toluene (17 mL) was added trifluoromethansulfonic acid (2 mL, 20.0 mmol). The reaction mixture was allowed to stir at 100° C. for 16 h. Excess solvent was removed under reduced pressure and the crude compound was purified by HPLC to provide 3-[2-[(2-methylpyrimidin-4-yl)amino]-4-pyridyl]-7,8-dihydro-6H-1,6-naphthyridin-5-one I-406 (0.13 g, 3.8%). LCMS (FA): m/z=333.2 (M+H). ¹H NMR (400 MHz, DMSO-d₆) δ 10.27 (s, 1H), 9.01 (d, J=2.4 Hz, 1H), 8.45 (d, J=2.4 Hz, 1H), 8.41 (d, J=5.3 Hz, 1H), 8.36 (d, J=5.9 Hz, 1H), 8.26 (s, 1H), 8.11 (s, 1H), 7.68 (d, J=5.9 Hz, 1H), 7.44 (dd, J=5.3, 1.6 Hz, 1H), 3.52 (td, J=6.7, 2.7 Hz, 2H), 3.13 (t, J=6.7 Hz, 2H), 2.45 (s, 3H)

Examples 55a and 55b: N-(5-(4-(dimethylamino)-1,1-dioxidoisothiazolidin-2-yl)-6-methyl-[3,4′-bipyridin]-2′-yl)acetamide (I-496 (peak 1)) and (R or S)—N-(5-(4-(dimethylamino)-1,1-dioxidoisothiazolidin-2-yl)-6-methyl-[3,4′-bipyridin]-2′-yl)acetamide (I-497 (peak 2))

Step 1: (E)-N-(5-bromo-2-methylpyridin-3-yl)-2-phenylethenesulfonamide

(E)-2-phenylethenesulfonyl chloride (5.4 g, 26.7 mmol) was added in portions over a period of 0.5 h to a stirred solution of 5-bromo-2-methylpyridin-3-amine (5.0 g, 26.7 mmol) in anhydrous pyridine (30 mL). The reaction mixture was allowed to warm to rt and stirred for an additional 0.5 h. The solvent was evaporated under reduced pressure to give crude (E)-N-(5-bromo-2-methylpyridin-3-yl)-2-phenylethenesulfonamide which was used without further purification.

Step 2: (E)-N-allyl-N-(5-bromo-2-methylpyridin-3-yl)-2-phenylethenesulfonamide

A solution of (E)-N-(5-bromo-2-methylpyridin-3-yl)-2-phenylethenesulfonamide (3.4 g, 26.6 mmol) in ACN (90 mL) was treated with potassium carbonate (11.0 g, 80.0 mmol) and sodium iodide (1.3 g, 8.78 mmol) followed by allyl bromide (19.3 g, 160 mmol) and heated under reflux for 3 h. The reaction mixture was partitioned between water (100 mL) and DCM (50 mL) and the organic solution separated, dried over Na₂SO₄, filtered and concentrated. The crude product was purified by column chromatography to give (E)-N-allyl-N-(5-bromo-2-methylpyridin-3-yl)-2-phenylethenesulfonamide (6.8 g, 95%) as a yellow solid. LCMS: m/z=396.0.

Step 3: 2-(5-bromo-2-methylpyridin-3-yl)-2,3-dihydroisothiazole 1,1-dioxide

A solution of (E)-N-allyl-N-(5-bromo-2-methylpyridin-3-yl)-2-phenylethenesulfonamide (3.0 g, 7.63 mmol) in degassed DCM (100 mL) was treated with (1,3-Bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)dichloro(phenylmethylene)(tricyclohexylphosphine)ruthenium, Benzylidene[1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene]dichloro(tricyclohexylphosphine)ruthenium, [1,3-Bis-(2,4,6-trimethylphenyl)-2-imidazolidinylidene]dichloro(phenylmethylene)(tricyclohexylphosphine) ruthenium Grubbs's second generation catalyst (389 mg, 0.46 mmol) and allowed to stir under an atmosphere of nitrogen for 3 h at reflux. The crude product was purified by column chromatography to give 2-(5-bromo-2-methylpyridin-3-yl)-2,3-dihydroisothiazole 1,1-dioxide (1.8 g, 82%) LCMS: m/z=289.0.

Step 4: 2-(5-bromo-2-methylpyridin-3-yl)-4-(dimethylamino)isothiazolidine 1,1-dioxide

2-(5-Bromo-2-methylpyridin-3-yl)-2,3-dihydroisothiazole 1,1-dioxide (2.0 g, 6.92 mmol) was suspended in a solution of dimethylamine (6.9 mL, 13.8 mmol) in ethanol (25 mL) and allowed to stir at rt for 16 h. The solvent was removed under reduced pressure and the crude product purified by column chromatography to give 2-(5-bromo-2-methylpyridin-3-yl)-4-(dimethylamino)isothiazolidine 1,1-dioxide (72%). LCMS (FA): m/z=334.0.

Step 5: (N-(5-(4-(dimethylamino)-1,1-dioxidoisothiazolidin-2-yl)-6-methyl-[3,4′-bipyridin]-2′-yl)acetamide (peak 1) and N-(5-(4-(dimethylamino)-1,1-dioxidoisothiazolidin-2-yl)-6-methyl-[3,4′-bipyridin]-2′-yl)acetamide (peak 2)

were prepared according to the procedure in Example 56, Step 4 using 2-(5-bromo-2-methylpyridin-3-yl)-4-(dimethylamino)isothiazolidine 1,1-dioxide and N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]acetamide to give N-(5-(4-(dimethylamino)-1,1-dioxidoisothiazolidin-2-yl)-6-methyl-[3,4′-bipyridin]-2′-yl)acetamide. The racemic compound was separated by chiral SFC (Conditions: SFC Column: Chiralpak ID 10×250 mm 5 micron column Solvent: 40% [0.3% DEA in EtOH]/60% [CO2], Flow Rate: 10 mL/min, Back Pressure Regulator: 10 MPa) to provide N-(5-(4-(dimethylamino)-1,1-dioxidoisothiazolidin-2-yl)-6-methyl-[3,4′-bipyridin]-2′-yl)acetamide (peak1) I-496 LCMS (FA): m/z=390.2 (M+H) and N-(5-(4-(dimethylamino)-1,1-dioxidoisothiazolidin-2-yl)-6-methyl-[3,4′-bipyridin]-2′-yl)acetamide (peak2) I-497 LCMS (FA): m/z=390.1 (M+H).

The compounds listed in the table below (Table 41) were prepared in an analogous fashion to that described above from the appropriate starting materials:

TABLE 41 Starting Material Compound LCMS Example Reagent Chemical Structure No. Data 57A gj

I-325 LCMS (FA): m/z = 376.3 (M + H) 53B gj

I-357 LCMS (FA): m/z = 453.2 (M + H)

XRPD Traces of compounds I-41 and I-299 are respectively provided in FIGS. 7 and 8.

Biological Protocols and Data:

Example 56: VPS34 Enzyme Assays

Cloning, Expression, and Purification of VPS34

VPS34 (accession number GB:BCO33004) was cloned into pDEST20-Thombin as N-terminal GST tagged fusion proteins using the Gateway system (Invitrogen, catalog#11804-013). The sequences were verified before recombinant protein expression using the Baculovirus Expression System with Gateway® Technology.

For expression VPS34 was infected at 1 MOI in SF9 cells and harvested 72 hours post infection.

For purification, VPS34 is purified by Glutathione Sepharose 4 Fast Flow (GE Healthcare #17-5132-03) followed by HiTrap Q (GE Healthcare #17-1153-01).

VPS34 Assay Conditions

Human VPS34 enzyme assay method

100 nL compounds in DMSO are added to wells of a 384 well microtitre plate (Greiner 780076). At room temperature: 5 ul VPS34 reaction buffer (Invitrogen Assay Buffer Q (diluted 1 in 5 with nanopure water) plus 2 mM DTT and 2 mM MnCl₂) containing ATP (20 uM, Promega) and 200 uM PI-PS substrate (Invitrogen PV5122) is added followed immediately by 5 ul VPS34 reaction buffer (as above) containing VPS34 (5 nM, Millennium Protein Sciences Group) and the mixture is incubated with shaking at room temperature for 1 hour. Then 5 ul VPS34 stop-detect mix (as per Invitrogen Adapta Assay kit (PV5009) instructions (contains kinase quench buffer, TR-FRET buffer, Adapta Eu anti-ADP antibody and Alexa Fluor 647 ADP tracer)) is added to quench the reaction. The plates are then incubated for 30 minutes at room temperature with shaking and then read on a BMG PheraStar Plus reader.

For the assay methods described above, test compound percent inhibition, at various concentrations, is calculated relative to control (DMSO and EDTA) treated samples. Compound concentration versus percent inhibition curves are fitted to generate IC₅₀ values. One skilled in the art will appreciate that the values generated either as percentage inhibition at a single concentration or IC₅₀ values are subject to experimental variation.

Inhibition of VPS34

In some embodiments, compounds of the invention were assayed at a concentration of 1.11 μM with the % inhibition values as shown in the table below (Table 37). Additionally, compounds of the invention inhibit VPS34 with the following IC₅₀ ranges: (A) <10 nM; (B) 10 nM-<50 nM; (C) 50 nM-<100 nM; or (D) greater than 100 nM.

TABLE 37 Compound Percent Inhibition IC₅₀ I-1 >99 A I-2 >99 B I-3 87 C I-4 >99 B I-5 >99 A I-6 >99 B I-7 >99 A I-8 >99 D I-9 >99 B I-10 >99 A I-11 >99 A I-12 >99 A I-13 81 D I-14 >99 B I-15 >99 B I-16 >99 A I-17 >99 C I-18 >99 A I-19 >99 C I-20 >99 C I-21 >99 B I-22 >99 B I-23 >99 A I-24 >99 A I-25 >99 B I-26 >99 C I-27 >99 A I-28 >99 A I-29 >99 B I-30 >99 A I-31 >99 B I-32 >99 A I-33 >99 B I-34 >99 A I-35 >99 B I-36 >99 A I-37 >99 A I-38 >99 B I-39 >99 A I-40 >99 A I-41 >99 A I-42 >99 B I-43 >99 A I-44 >99 A I-45 >99 A I-46 >99 B I-47 >99 B I-48 >99 D I-49 >99 C I-50 >99 B I-51 91 C I-52 >99 A I-53 67 D I-54 83 D I-55 >99 A I-56 >99 B I-57 >99 B I-58 >99 A I-59 >99 A I-60 >99 B I-61 95 B I-62 >99 A I-63 >99 A I-64 >99 A I-65 93 D I-66 88 D I-67 >99 C I-68 98 D I-69 >99 B I-70 >99 A I-71 >99 A I-72 >99 A I-73 >99 A I-74 >99 A I-75 >99 C I-76 >99 A I-77 >99 A I-78 >99 A I-79 >99 B I-80 >99 A I-81 >99 A I-82 >99 B I-83 82 D I-84 >99 A I-85 90 D I-86 >99 A I-87 >99 A I-88 >99 B I-89 >99 B I-90 >99 A I-91 >99 A I-92 >99 B I-93 86 B I-94 98 A I-95 >99 B I-96 >99 B I-97 >99 A I-98 >99 B I-99 >99 B I-100 >99 A I-101 >99 A I-102 >99 B I-103 >99 A I-104 >99 A I-105 >99 D I-106 64 D I-107 >99 A I-108 >99 B I-109 >99 A I-110 >99 A I-111 >99 A I-112 >99 C I-113 >99 A I-114 >99 B I-115 68 D I-116 68 D I-117 >99 B I-118 >99 B I-119 >99 A I-120 >99 A I-121 >99 C I-122 >99 C I-123 >99 A I-124 91 A I-125 >99 A I-126 >99 C I-127 >99 C I-128 >99 A I-129 100 D I-130 >99 C I-131 >99 A I-132 >99 A I-133 >99 A I-134 >99 B I-135 99 D I-136 >99 A I-137 >99 B I-138 >99 B I-139 61 D I-140 >99 B I-141 >99 A I-142 >99 A I-143 >99 A I-144 >99 A I-145 >99 C I-146 >99 B I-147 >99 A I-148 >99 B I-149 >99 B I-150 >99 A I-151 >99 B I-152 >99 B I-153 >99 A I-154 >99 A I-155 >99 A I-156 >99 A I-157 >99 B I-158 >99 A I-159 >99 A I-160 >99 B I-161 >99 A I-162 >99 B I-163 >99 A I-164 >99 A I-165 >99 A I-166 >99 A I-167 >99 B I-168 >99 A I-169 >99 B I-170 >99 A I-171 >99 A I-172 >99 B I-173 >99 A I-174 >99 A I-175 >99 B I-176 >99 B I-177 >99 B I-178 >99 A I-179 >99 A I-180 >99 C I-181 >99 A I-182 >99 A I-183 >99 A I-184 74 D I-185 >99 A I-186 >99 B I-187 >99 A I-188 98 C I-189 >99 C I-190 96 B I-191 77 D I-192 >99 C I-193 >99 C I-194 62 D I-195 >99 A I-196 >99 A I-197 >99 B I-198 68 D I-199 >99 A I-200 >99 A I-201 >99 A I-202 >99 C I-203 >99 A I-204 >99 A I-205 >99 B I-206 >99 A I-207 >99 A I-208 >99 B I-209 49 D I-210 >99 C I-211 >99 A I-212 95 C I-213 >99 C I-214 >99 A I-215 99 B I-216 97 C I-217 >99 A I-218 >99 B I-219 92 C I-220 99 B I-221 97 B I-222 93 B I-223 95 B I-224 99 B I-225 >99 A I-226 94 B I-227 >99 B I-228 >99 A I-229 >99 A I-230 97 B I-231 26 D I-232 81 B I-233 96 B I-234 90 B I-235 92 B I-236 98 B I-237 91 B I-238 93 A I-239 >99 A I-240 >99 B I-241 96 B I-242 88 B I-243 85 B I-244 82 B I-245 >99 B I-246 91 B I-247 >99 B I-248 >99 B I-249 85 C I-250 99 B I-251 97 B I-252 >99 B I-253 96 B I-254 77 B I-255 95 A I-256 94 B I-257 >99 B I-258 88 B I-259 79 A I-260 91 B I-262 81 B I-263 53 D I-264 100 A I-265 >99 A I-266 100 B I-267a 97 B I-267b 94 B I-268 100 D I-269 >99 B I-271 91 B I-272 >99 C I-273 >99 A I-274 >99 B I-275 >99 B I-276 96 A I-277 100 A I-278 >99 B I-279 93 B I-280 83 D I-281 40 D I-282 94 A I-283 >99 B I-284 >99 B I-285 85 B I-286 >99 A I-287 91 D I-288 91 B I-289 >99 A I-290 >99 B I-291 95 A I-292 99 B I-293 >99 A I-294 94 A I-295 80 C I-296 90 B I-297 >99 B I-298 99 A I-299 98 B I-300 96 B I-301 96 B I-302 83 B I-303 95 B I-304 96 B I-305 94 B I-306 >99 B I-307 >99 B I-308 >99 A I-309 99 A I-310 >99 A I-311 >99 A I-312 >99 B I-313 88 B I-314 91 B I-315 92 B I-318 97 B I-319 94 D I-320 95 B I-321 >99 C I-322 96 B I-323 73 B I-324 >99 B I-325 >99 B I-326 96 A I-329 >99 B I-330 >99 D I-331 93 D I-332 >99 B I-333 >99 B I-334 82 D I-335 92 B I-336 96 B I-337 52 D I-338 >99 B I-339 98 B I-340 91 B I-341 >99 B I-342 >99 A I-343 >99 B I-344 >99 B I-346 95 B I-347 22 D I-348 >99 B I-349 94 B I-350 >99 A I-352 92 C I-353 >99 B I-354 98 B I-355 91 B I-356 >99 A I-357 >99 B I-358 >99 B I-359 >99 B I-361 90 B I-362 95 B I-363 83 D I-364 >99 B I-365 >99 B I-366 >99 B I-367 76 C I-368 96 B I-369 97 B I-370 >99 B I-371 >99 A I-372 >99 A I-373 >99 B I-374 >99 B I-375 99 A I-376 94 B I-377 95 B I-378 66 D I-379 47 D I-380 95 D I-381 >99 A I-382 >99 A I-383 91 B I-384 73 D I-386 96 B I-387 >99 B I-388 98 C I-389 95 A I-390 98 B I-391 >99 B I-392 82 D I-394 >99 B I-395 >99 B I-396 94 B I-397 100 C I-398 93 D I-399 100 B I-401 >99 A I-402 93 B I-403 92 D I-404 94 B I-405 >99 B I-406 80 D I-407 98 B I-408 >99 B I-409 82 D I-410 96 B I-411 88 A I-412 97 B I-413 >99 B I-414 89 C I-415 82 B I-416 >99 B I-417 >99 A I-418 >99 B I-419 56 D I-420 59 D I-421 90 B I-422 96 B I-423 >99 B I-424 >99 B I-425 100 B I-426 >99 B I-427 >99 A I-428 >99 A I-429 96 B I-430 92 B I-431 74 D I-432 98 B I-433 93 B I-434 36 D I-435 96 A I-436 89 C I-437 >99 B I-438 >99 B I-439 69 D I-440 83 D I-441 >99 A I-442 >99 B I-443 >99 B I-444 >99 B I-445 >99 B I-446 >99 B I-447 98 A I-448 87 B I-449 94 B I-450 87 B I-452 >99 B I-454 >99 A I-455 >99 B I-456 >99 A I-457 95 B I-458 >99 B I-459 96 B I-460 60 D I-462 98 D I-463 >99 A I-464 >99 B I-465 97 B I-466 92 B I-467 >99 A I-468 >99 B I-469 >99 B I-470 >99 B I-471 98 B I-472 96 D I-473 87 B I-474 89 B I-475 >99 B I-476 87 B I-477 93 B I-478 84 B I-479 98 B I-480 99 C I-481 >99 B I-482 >99 C I-483 >99 B I-484 92 C I-485 100 B I-486 84 A I-487 71 D I-488 >99 B I-490 >99 A I-491 98 B I-492 86 D I-493 99 B I-494 91 C I-495 83 B I-496 >99 B I-497 >99 B I-498 83 B I-499 >99 B

Example 57: Cellular Assay for Anti-Proliferative Activity of VPS34 Inhibitors in Combination with a Second Therapeutic Agent

Cells were plated in 25 ml of media in 384 well plates at 1,000 cells per well (A431, PC9, and NCI-H1650 cell lines), 1,500 cells per well (NCI-H1975) or 2,000 cells per well (NCI-H1650). The plates were incubated for 24 hrs at 37° C., 6% CO₂. The test compounds (see Table 38 below) were diluted serially, and 62.5 nL of each compound solution (or DMSO, if it is a single agent experiment) is added so the total added to the cells is 125 nL. Cell plates were incubated for 72 hrs at 37° C., 6% CO₂. Cell Titer Glo reagent (Promega) was added. The plates were then incubated for 10 minutes at room temperature before luminescence was read on a plate reader such as the Pherastar Plus, Pherastar FS, or LEADSeeker imaging system.

Synergy was measured by the Bliss synergy (Bliss, C.I. Ann. Appl. Biol. 26: 585-615 (1939). The Bliss independence model assumes that the fraction of cells that survives the treatment with both drugs is equal to the fraction that survives drug A alone times the fraction that survives drug B alone. Thus, the Bliss independence model predicts the cell survival based on ten single drug response curves. Here, Bliss synergy was defined as the percent cell survival predicted by the response surface minus the cell survival predicted by Bliss independence. Each dose combination showed a different Bliss synergy value, so the maximum Bliss synergy over all possible doses was reported. Bliss antagonism was defined similarly.

Bliss dependence was defined as the percent cell survival at a certain dose combination divided by the percent cell survival predicted by Bliss independence. More specifically, the Bliss dependence is vAB/(vA*vB), where vAB is the viability with drug A and drug B added, while vA and vB are the viabilities with each drug alone. The dose for the combination used in this study is the inflection point for each drug alone.

Another way to evaluate additivity is through consideration of Loewe additivity. A difference between Bliss independence and Loewe additivity evaluations of drug combination data is that Bliss independence evaluates whether two drugs interact at all (the null hypothesis is that the mechanisms are entirely independent) and Loewe additivity evaluates whether two drugs interact in an additive fashion (the null hypothesis is that the two drugs work by identical mechanisms). For Bliss independence, the boundary between additivity and synergy must be measured. For Loewe additivity, this boundary is assumed to be at a value of 1. Thus, Bliss independence provides a boundary between antagonism and synergy or additivity. Loewe additivity provides a boundary between synergy and independence or antagonism.

Synergy can also be measured by nonlinear blending synergy. Nonlinear blending synergy [Peterson, J. J. and Novik, S. J. J Recept Signal Transduct Res, 27, 12-146 (2007))] is found by considering the percent cell death values along the nonlinear blending plot. If the maximum cell death occurs between the endpoints, then the blending synergy is the difference between the maximum cell death for the combined drugs and the maximum cell death for the either drug alone.

A derivative of Loewe additivity is the Combination Index, I (see Chou T. C., Talalay P. Adv. Enzyme Reg., 22: 27-55 (1984) and Berenbaum M. C. J. Theor. Biol., 114:413-431 (1985)). This measure is based on the shape of the isobologram which represents 50% viability (for a review of the use of isobolograms in analysis of drug combinations, see Tallarida, R. J. J. Pharm. Exp. Therap. 319:1-7 (2006)). The Combination Index, I, can be calculated from the equation I=D_(A)/EC50_(A)+D_(B)/EC50_(B), where EC50_(A) and EC50_(B) are the doses of drugs A and B alone, respectively, that result in cell viability of 50% and the dose combination (D_(A),D_(B)) is the point at which the estimated viability is 50%, where D_(A)/D_(B)=EC50A/EC50B.

The results in Table 38A were summarized by categorizing the Combination Index, I. A mean Combination Index in the range (0.7-1.3) is classified as Additivity. A mean in the range (0-0.7) is classified as Synergy. A mean in the range (1.3-2) is classified as Subadditivity. A mean greater than 2 is classified as Antagonism. In some cases, the Combination Index does not exist because the 50 percent isobologram does not intersect both axes. In this case, the Nonlinear Blending Synergy is used instead to generate a call (Table 38B). The categorization is similar to the Combination Index. A Nonlinear Blending Synergy within the range (−20, 20) is classified as Additive. A value below −20 is classified as Antagonism, while a value above 20 is classified as Synergy.

TABLE 38A Anti-proliferative Activity of Compounds of formula I (Compound X) in Combination with a Second Therapeutic Agent (Compound Y) Compound Compound Combination Cell Line X Y Index Meaning A431 I-41 Afatinib 0.24 Synergy A431 I-41 Erlotinib 0.38 Synergy A431 I-32 Afatinib 0.25 Synergy A431 I-32 Erlotinib 0.73 Additivity A431 I-94 Erlotinib 0.38 Synergy A431 I-299 Erlotinib 1.01 Additivity A431 I-299 Afatinib 1.01 Additivity A431 I-41 AZD9291 0.62 Synergy A431 I-299 AZD9291 1.00 Additivity A431 I-217 Erlotinib 0.46 Synergy A431 I-94 Afatinib 0.23 Synergy A431 I-153 Afatinib 0.23 Synergy A431 I-217 Afatinib 0.36 Synergy A431 I-304 AZD9291 0.78 Additivity A431 I-299 CO-1686 1.02 Additivity A431 I-41 CO-1686 0.74 Additivity A431 I-308 CO-1686 0.88 Additivity A431 I-304 CO-1686 0.99 Additivity NCI H-1650 I-41 Afatinib 0.72 Additivity NCI H-1650 I-32 Afatinib 0.40 Synergy NCI H-1650 I-299 Afatinib 0.47 Synergy NCI H-1650 I-41 AZD9291 0.92 Additivity NCI H-1650 I-299 AZD9291 0.87 Additivity NCI H-1650 I-94 Afatinib 0.65 Synergy NCI H-1650 I-153 Afatinib 0.64 Synergy NCI H-1650 I-217 Afatinib 0.31 Synergy NCI H-1650 I-308 Afatinib 0.55 Synergy NCI H-1650 I-308 AZD9291 0.53 Synergy NCI H-1650 I-304 AZD9291 0.80 Additivity NCI H-1650 I-299 CO-1686 0.43 Synergy NCI H-1650 I-41 CO-1686 0.58 Synergy NCI H-1650 I-308 CO-1686 0.36 Synergy NCI H-1650 I-304 CO-1686 0.47 Synergy NCI-H1975 I-41 Afatinib 0.58 Synergy NCI-H1975 I-32 Afatinib 0.66 Synergy NCI-H1975 I-94 Afatinib 0.54 Synergy NCI-H1975 I-299 Afatinib 0.68 Synergy NCI-H1975 I-217 Afatinib 0.52 Synergy NCI-H1975 I-308 Afatinib 0.84 Additivity NCI-H1975 I-41 AZD9291 0.45 Synergy NCI-H1975 I-299 AZD9291 0.54 Synergy NCI-H1975 I-308 AZD9291 0.72 Additivity NCI-H1975 I-304 AZD9291 1.00 Additivity NCI-H1975 I-41 CO-1686 0.51 Synergy NCI-H1975 I-299 CO-1686 0.72 Additivity NCI-H1975 I-308 CO-1686 0.60 Synergy NCI-H1975 I-304 CO-1686 0.77 Additivity PC9 I-41 Afatinib 1.02 Additivity PC9 I-41 Erlotinib 1.02 Additivity PC9 I-32 Afatinib 0.79 Additivity PC9 I-32 Erlotinib 0.78 Additivity PC9 I-94 Afatinib 1.04 Additivity PC9 I-94 Erlotinib 0.91 Additivity PC9 I-299 Erlotinib 1.18 Additivity PC9 I-153 Erlotinib 0.97 Additivity PC9 I-217 Erlotinib 0.87 Additivity PC9 I-308 Erlotinib 1.36 Subadditivity PC9 I-299 Afatinib 1.37 Subadditivity PC9 I-153 Afatinib 1.17 Additivity PC9 I-217 Afatinib 0.97 Additivity PC9 I-308 Afatinib 1.49 Subadditivity PC9 I-41 AZD9291 0.92 Additivity PC9 I-299 AZD9291 1.17 Additivity PC9 I-308 AZD9291 1.33 SubAdditivity PC9 I-304 AZD9291 0.98 Additivity PC9 I-41 CO-1686 0.84 Additivity PC9 I-299 CO-1686 1.00 Additivity PC9 I-308 CO-1686 1.19 Additivity PC9 I-304 CO-1686 0.90 Additivity

TABLE 38B Anti-proliferative Activity of Compounds of formula I (Compound X) in Combination with a Second Therapeutic Agent (Compound Y) Blending Cell Line Compound X Compound Y Synergy Meaning A431 I-153 Erlotinib 16.3 Additivity A431 I-308 Erlotinib 15.2 Additivity A431 I-308 Afatinib 11.2 Additivity A431 I-308 AZD9291 10.2 Additivity NCI H-1650 I-299 Erlotinib 26.93 Synergy NCI H-1650 I-41 Erlotinib 20.5 Synergy NCI H-1650 I-32 Erlotinib 22.29 Synergy NCI H-1650 I-94 Erlotinib 23.69 Synergy NCI H-1650 I-153 Erlotinib 23.76 Synergy NCI H-1650 I-217 Erlotinib 28.65 Synergy NCI H-1650 I-308 Erlotinib 27.0 Synergy NCI-H1975 I-153 Afatinib 8.73 Additive

Example 58: Tumor Xenograft Model

The in vivo efficacy of the compounds of formula I described herein as, e.g., single agent or combination therapy with a second therapeutic agent, can be studied using tumor xenograft models.

Female nude mice were inoculated subcutaneously in flank with 2.0×10⁶ human colorectal adenocarcinoma cells SW48. Similar experiments were conducted using human non-small cell lung cancer cells PC9, NCI-H1650, and NCI-H1975. In these experiments, female nude mice were inoculated subcutaneously in the flank with 2.0×10⁶ cells+matrigel.

Tumor growth was monitored with vernier calipers. The mean tumor volume was calculated using the formula V=W²×L/2. When the mean tumor volume reached approximately 150-200 mm³, the animals were randomized into treatment groups. See Tables 39, 40, and 41 below. Test compounds (either compounds of formula I such as I-41, other therapeutic agents such as erlotinib, or combination thereof), and vehicle control were administered by oral gavage as described in the tables below. The vehicle was 3.5% w/v NaHCO₃ in water or 100% PEG400. Tumor growth was measured twice per week. See also FIGS. 1-6.

TABLE 39 Study design for SW48 xenograft model Compounds Group Administered Dose Route and Schedule 1 Vehicle N/A PO QDx14 + PO QDx14 (3.5% NaHCO₃ + 100% PEG400) 2 I-41 12.5 mg/kg PO QDx14 3 erlotinib   25 mg/kg PO QDx14 4 I-41 + erlotinib 12.5 mg/kg + PO QDx14 + PO QDx14 25 mg/kg

TABLE 40 Study design for PC9 and H1650 xenograft models Compounds Group Administered Dose Route and Schedule 1 Vehicle N/A PO QDx21 + PO (3.5% NaHCO₃ + QDx21 100% PEG400) 2 I-41 15 mg/kg PO QDx21 3 erlotinib 50 mg/kg PO QDx21 4 I-41 + erlotinib 15 mg/kg + 50 mg/kg PO QDx21 + PO QDx21

TABLE 41 Study design for NCI-1975 xenograft models Compounds Route Group Administered Dose and Schedule 1 Vehicle N/A PO QDx16 + PO (3.5% NaHCO₃ + 0.5% QDx16 Methylcellulose) 2 I-41 15 mg/kg PO QDx16 3 afatinib 15 mg/kg PO QDx16 4 I-41 + afatinib 15 mg/kg + PO QDx16 + PO 15 mg/kg QDx16

TABLE 42 Study design for PC9 and H1650 xenograft models Compounds Group Administered Dose Route and Schedule 1 Vehicle N/A PO QDx21 + PO QDx21 (10% HPbCD/3.5% NaHCO₃ + 100% PEG400) 2 I-299 0.65 mg/kg PO QDx21 3 Erlotinib   50 mg/kg PO QDx21 4 I-299 + Erlotinib 0.65 mg/kg + PO QDx21 + PO QDx21 50 mg/kg

While we have described a number of embodiments of this invention, it is apparent that our basic examples may be altered to provide other embodiments, which utilize the compounds and methods of this invention. Therefore, it will be appreciated that the scope of this invention is to be defined by the appended claims rather than by the specific embodiments, which have been represented by way of example. 

We claim:
 1. A compound of formula I:

or a pharmaceutically acceptable salt thereof, wherein: R¹ is hydrogen, C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur; each of which being optionally substituted with 1-5 R⁶; R³ is C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur; each of which is optionally substituted with 1-5 R⁶; wherein: each R⁶ independently is —CN, halo or -L³-R⁷ wherein: L³ is a bond, C₁₋₄ alkylene, —O—, —N(R^(x))—, —S—, —S(O)—, —S(O)₂—, —C(O)—, —CO₂—, —N(R^(x))C(O)—, —N(R^(x))CO₂—, —S(O)₂NR^(x)—, —N(R^(x))S(O)₂—, —OC(O)N(R^(x))—, —N(R^(x))C(O)N(R^(x))—, —N(R^(x))S(O)₂N(R^(x))— or —OC(O)—; each R^(x), independently, is hydrogen or C₁₋₄ alkyl; R⁷ is hydrogen, C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; X is a bond or C₁₋₄ aliphatic; L¹ is —N(R⁸)C(O)—, —C(O)—N(R⁹)—, —N(R¹⁰)S(O)₂—, —S(O)₂NR¹¹—, —C(O)—, —C(S)—, —S(O)₂—, —O—C(O)—, —C(O)—O—, —O—S(O)₂—, —S(O)₂—O—, —N(R¹³)C(O)N(R¹⁴)—, or —N(R¹⁵)S(O)₂N(R¹⁶)—; and wherein each of R⁸, R⁹, R¹⁰, R¹¹, R¹³, R¹⁴, R¹⁵, and R¹⁶, independently, is hydrogen or C₁₋₄ alkyl; or X or L¹ optionally joining with R¹ to form an optionally substituted 5-6-membered heterocyclyl; R² is hydrogen or C₁₋₄ alkyl; L² is a bond, —C(O)—, —S(O)₂—, —C(O)—O—, —C(O)N(R^(y))—, or —S(O)₂N(R^(y))—; wherein each R^(y), independently, is hydrogen or C₁₋₄ alkyl; each occurrence of R⁴ and R⁵, independently, is —CN, halo or -L⁴-R¹⁷ wherein L⁴ is C₁₋₄ alkylene, —O—, —N(R^(z))—, —S—, —S(O)—, —S(O)₂—, —C(O)—, —CO₂—, —C(O)N(R^(z))—, —N(R^(z))C(O)—, —N(R^(z))C(O)O—, —S(O)₂N(R^(z))—, —N(R^(z))S(O)₂—, —OC(O)N(R^(z))—, —N(R^(z))C(O)N(R^(z))—, —N(R^(z))S(O)₂N(R^(z))— or —OC(O)—; each R^(z), independently, is hydrogen or C₁₋₄ alkyl, and R¹⁷ is hydrogen or C₁₋₆ aliphatic; and each of m and n, independently, is 0-3 provided that if one R⁴ is located at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is located, X or L¹ optionally joining with said R⁴ to form an optionally substituted 5-membered heterocyclyl or an optionally substituted 5-membered heteroaryl; or if one R⁴ is located at either ring carbon adjacent to the ring nitrogen, said R⁴ optionally joining with the ring nitrogen to form an optionally substituted 5-7-membered heterocyclyl or an optionally substituted 5-6-membered heteroaryl; or if L² is a bond and R³ is phenyl, naphthyl, or heteroaryl, R² optionally joining with a substituent of R³ to form an optionally substituted 5-7-membered heterocyclyl or an optionally substituted 5-6-membered heteroaryl.
 2. The compound of claim 1, having a structure according to formula I,

or a pharmaceutically acceptable salt thereof, wherein: R¹ is hydrogen, C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur; each of which being optionally substituted with 1-5 R⁶; R³ is C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur; each of which is optionally substituted with 1-5 R⁶; wherein: each R⁶ independently is —CN, halo or -L³-R⁷ wherein: L³ is a bond, C₁₋₄ alkylene, —O—, —N(R^(x))—, —S—, —S(O)—, —S(O)₂—, —C(O)—, —CO₂—, —N(R^(x))C(O)—, —N(R^(x))CO₂—, —S(O)₂NR^(x)—, —N(R^(x))S(O)₂—, —OC(O)N(R^(x))—, —N(R^(x))C(O)N(R^(x))—, —N(R^(x))S(O)₂N(R^(x))— or —OC(O)—; each R^(x), independently, is hydrogen or C₁₋₄ alkyl, and R⁷ is hydrogen, C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; X is a bond or C₁₋₄ aliphatic; L¹ is —N(R⁸)C(O)—, —C(O)—N(R⁹)—, —N(R¹⁰)S(O)₂—, —S(O)₂NR¹¹—, —C(O)—, —S(O)₂—, —O—C(O)—, —C(O)—O—, —O—S(O)₂—, —S(O)₂—O—, —N(R¹³)C(O)N(R¹⁴)—, or —N(R¹⁵)S(O)₂N(R¹⁶)—; and wherein each of R⁸, R⁹, R¹⁰, R¹¹, R¹³, R¹⁴, R¹⁵, and R¹⁶, independently, is hydrogen or C₁₋₄ alkyl; or X or L¹ optionally joining with R¹ to form an optionally substituted 5-6-membered heterocyclyl; R² is hydrogen or C₁₋₄ alkyl; L² is a bond, —C(O)—, —S(O)₂—, —C(O)—O—, —C(O)N(R^(y))—, or —S(O)₂N(R^(y))—; wherein each R^(y), independently, is hydrogen or C₁₋₄ alkyl; each occurrence of R⁴ and R⁵, independently, is —CN, halo or -L⁴-R¹⁷ wherein L⁴ is C₁₋₄ alkylene, —O—, —N(R^(z))—, —S—, —S(O)—, —S(O)₂—, —C(O)—, —CO₂—, —C(O)N(R^(z))—, —N(R^(z))C(O)—, —N(R^(z))C(O)O—, —S(O)₂N(R^(z))—, —N(R^(z))S(O)₂—, —OC(O)N(R^(z))—, —N(R^(z))C(O)N(R^(z))—, —N(R^(z))S(O)₂N(R^(z))— or —OC(O)—; each R^(z), independently, is hydrogen or C₁₋₄ alkyl, and R¹⁷ is hydrogen or C₁₋₆ aliphatic; and each of m and n, independently, is 0-3; provided that if one R⁴ is located at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is located, X or L¹ optionally joining with said R⁴ to form an optionally substituted 5-membered heterocyclyl or an optionally substituted 5-membered heteroaryl.
 3. The compound or a pharmaceutically acceptable salt of claim 1, wherein L¹ is —N(R⁸)C(O)—, —N(R¹⁰)S(O)₂—, —C(O)—, or —S(O)₂—.
 4. The compound or a pharmaceutically acceptable salt of claim 3, wherein each of R⁸ and R¹⁰, independently, is hydrogen, methyl or ethyl.
 5. The compound or a pharmaceutically acceptable salt of claim 1, wherein R¹ is C₁₋₄ aliphatic, 3-6-membered cycloaliphatic, phenyl, naphthyl, 3-6-membered heterocyclyl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-6-membered heteroaryl having 1-3 heteroatoms independently selected from nitrogen, oxygen or sulfur.
 6. A compound of formula I:

or a pharmaceutically acceptable salt thereof, wherein R¹ is

R³ is C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, 3-10-membered heterocyclyl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen or sulfur; each of which is optionally substituted with 1-5 R⁶; wherein: each R⁶ independently is —CN, halo or -L³-R⁷ wherein: L³ is a bond, C₁₋₄ alkylene, —O—, —N(R^(x))—, —S—, —S(O)—, —S(O)₂—, —C(O)—, —CO₂—, —C(O)NR^(x)—, —N(R^(x))C(O)—, —N(R^(x))CO₂—, —S(O)₂NR^(x)—, —N(R^(x))S(O)₂—, —OC(O)N(R^(x))—, —N(R^(x))C(O)N(R^(x))—, —N(R^(x))S(O)₂N(R^(x))— or —OC(O)—; each R^(x), independently, is hydrogen or C₁₋₄ alkyl; R⁷ is hydrogen, C₁₋₆ aliphatic, 3-10-membered cycloaliphatic, phenyl, naphthyl, or 5-10-membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; X is a bond or C₁₋₄ aliphatic; L¹ is —N(R⁸)C(O)—, —C(O)—N(R⁹)—, —N(R^(o))S(O)₂—, —S(O)₂NR¹¹—, —C(O)—, —C(S)—, —S(O)₂—, —N(R¹²)—, —O—C(O)—, —C(O)—O—, —O—S(O)₂—, —S(O)₂—O—, —N(R¹³)C(O)N(R¹⁴)—, or —N(R¹⁵)S(O)₂N(R¹⁶)—; and wherein each of R⁸, R⁹, R¹⁰, R¹¹, R¹³, R¹⁴, R¹⁵, and R¹⁶, independently, is hydrogen or C₁₋₄ alkyl; or X or L¹ optionally joining with R¹ to form an optionally substituted 5-6-membered heterocyclyl or optionally substituted 5-6-membered heteroaryl; R² is hydrogen or C₁₋₄ alkyl; L² is a bond, —C(O)—, —S(O)₂—, —C(O)—O—, —C(O)N(R^(y))—, or —S(O)₂N(R^(y))—; wherein each R^(y), independently, is hydrogen or C₁₋₄ alkyl; each occurrence of R⁴ and R⁵, independently, is —CN, halo or -L⁴-R¹⁷ wherein L⁴ is C₁₋₄ alkylene, —O—, —N(R^(z))—, —S—, —S(O)—, —S(O)₂—, —C(O)—, —CO₂—, —C(O)N(R^(z))—, —N(R^(z))C(O)—, —N(R^(z))C(O)O—, —S(O)₂N(R^(z))—, —N(R^(z))S(O)₂—, —OC(O)N(R^(z))—, —N(R^(z))C(O)N(R^(z))—, —N(R^(z))S(O)₂N(R^(z))— or —OC(O)—; each R^(z), independently, is hydrogen or C₁₋₄ alkyl, and R¹⁷ is hydrogen or C₁₋₆ aliphatic; and each of m and n, independently, is 0-3 provided that if one R⁴ is located at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is located, X or L¹ optionally joining with said R⁴ to form an optionally substituted 5-7-membered heterocyclyl or an optionally substituted 5-6-membered heteroaryl; or if one R⁴ is located at either ring carbon adjacent to the ring nitrogen, said R⁴ optionally joining with the ring nitrogen to form an optionally substituted 5-7-membered heterocyclyl or an optionally substituted 5-6-membered heteroaryl; or if L² is a bond and R³ is phenyl, naphthyl, or heteroaryl, R² optionally joining with a substituent of R³ to form an optionally substituted 5-7-membered heterocyclyl or an optionally substituted 5-6-membered heteroaryl.
 7. The compound or a pharmaceutically acceptable salt of claim 1, wherein X is a bond, methylene, or ethylene.
 8. The compound or a pharmaceutically acceptable salt of claim 1, wherein R² is hydrogen.
 9. The compound or a pharmaceutically acceptable salt of claim 1, wherein L² is a bond, —C(O)— or —C(O)—O—.
 10. The compound or a pharmaceutically acceptable salt of claim 1, wherein R³ is methyl, cyclopropyl, or 6-membered heteroaryl that is optionally substituted with 1-2 R⁶.
 11. The compound or a pharmaceutically acceptable salt of claim 1, wherein: R⁴ is fluoro, chloro, unsubstituted C₁₋₃ aliphatic, trifluoromethyl, hydroxyl, methoxy, —NH₂ or —NH—C₁₋₃ aliphatic; m is 0-2; wherein one R⁴, if present, is located at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is substituted.
 12. The compound or a pharmaceutically acceptable salt of claim 1, wherein: X is a bond; L¹ is —N(R⁸)C(O)—, —N(R¹⁰)S(O)₂—, —C(O)—, or —S(O)₂—; R² is hydrogen, methyl, ethyl, or cyclopropylmethyl; L² is a bond, —C(O)— or —C(O)—O—; R³ is C₁₋₃ alkyl, cyclopropyl, or 6-membered heteroaryl, each of which being optionally substituted with 1-2 R⁶; R⁴ is fluoro, chloro, C₁₋₃ alkyl, trifluoromethyl, hydroxyl, methoxy, —NH₂ or —NH—C₁₋₃ aliphatic; m is 0-2; wherein one R⁴, if present, is located at the ring carbon between the ring nitrogen and the ring carbon to which —X-L¹-R¹ is substituted; n is 0 or 1; and R¹ is


13. The compound of claim 1 with formula (II) below:

wherein (m-1) is 0 or 1; or a pharmaceutically acceptable salt thereof.
 14. The compound or a pharmaceutically acceptable salt of claim 13, wherein: L¹ is —N(R⁸)C(O)— or —N(R¹⁰)S(O)₂—; each of R⁸ and R¹⁰, independently, is hydrogen, methyl, or ethyl; R¹ is C₁₋₄ aliphatic, phenyl, naphthyl, 3-6-membered cycloaliphatic, 3-6-membered heterocyclyl having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 5-6-membered heteroaryl having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur; R³ is C₁₋₃ alkyl or cyclopropyl, each of which being optionally substituted with 1-2 R⁶; each R⁶ is C₁₋₄ alkyl or halo; and R⁴ is halo or -L⁴-R¹⁷ wherein: L⁴ is C₁₋₄ alkylene, —O—, or —N(R^(z))—; R^(z) is hydrogen or methyl; and R¹⁷ is hydrogen or C₁₋₃ aliphatic.
 15. The compound or a pharmaceutically acceptable salt of claim 14, wherein R⁴ is methyl, ethyl, fluoro, chloro, —NH₂, methoxy, or ethoxy.
 16. The compound or a pharmaceutically acceptable salt of claim 14, wherein (m-1) is
 0. 17. The compound of claim 1 with formula (VIII) below:

wherein (m-1) is 0 or 1; or a pharmaceutically acceptable salt thereof.
 18. A compound or a pharmaceutically acceptable salt thereof selected from


19. A pharmaceutical composition comprising a compound or a pharmaceutically acceptable salt of claim 1, and a pharmaceutically acceptable carrier.
 20. The pharmaceutical composition of claim 19, further comprising a second therapeutic agent.
 21. The pharmaceutical composition of claim 20, wherein the second therapeutic agent is a tyrosine kinase inhibitor.
 22. The compound or a pharmaceutically acceptable salt of claim 17, wherein: L¹ is —N(R¹¹)S(O)₂—; and R¹⁰ optionally joins with R⁴ to form an optionally substituted 5-membered heterocyclyl or an optionally substituted 5-membered heteroaryl.
 23. The compound or a pharmaceutically acceptable salt of claim 22, wherein: R⁴ is halo or -L⁴-R¹⁷; wherein L⁴ is C₁₋₄ alkylene, —O—, or —N(R^(z))—; R^(z) is hydrogen or methyl, R¹⁷ is hydrogen or C₁₋₃ aliphatic; and R⁶ is cyano, fluoro, chloro, C₁₋₆ alkyl, 3-6-membered cycloalkyl, or phenyl.
 24. The compound or a pharmaceutically acceptable salt of claim 23, wherein R⁴ is methyl, ethyl, fluoro, chloro, —NH₂, methoxy, or ethoxy.
 25. The compound or a pharmaceutically acceptable salt of claim 24, wherein (m-1) is
 0. 26. The compound or a pharmaceutically acceptable salt of claim 24, wherein: the compound is represented by formula VIII-B

wherein the R⁴ located at the para position with respect to the ring nitrogen is methyl.
 27. The compound of claim 1, wherein the compound is selected from:

or a pharmaceutically acceptable salt thereof.
 28. The compound of claim 27, wherein the compound is:

or a pharmaceutically acceptable salt thereof.
 29. The compound of claim 27, wherein the compound is:

or a pharmaceutically acceptable salt thereof. 